diff --git a/.github/workflows/cloud-deploy-relay-asia-topology.yml b/.github/workflows/cloud-deploy-relay-asia-topology.yml
index 3e8929376be..7787da8efb4 100644
--- a/.github/workflows/cloud-deploy-relay-asia-topology.yml
+++ b/.github/workflows/cloud-deploy-relay-asia-topology.yml
@@ -79,6 +79,7 @@ jobs:
             production:production-gce-c31) ;;
             production:production-gce-c32,production-gce-c33) target_region=us-central1 ;;
             production:production-gce-c34) ;;
+            production:production-gce-c35) ;;
             *) echo "cell-ids do not match the reviewed environment topology" >&2; exit 1 ;;
           esac
           echo "TARGET_REGION=${target_region}" >> "${GITHUB_ENV}"
diff --git a/.github/workflows/cloud-deploy-relay-production-same-cap-job.yml b/.github/workflows/cloud-deploy-relay-production-same-cap-job.yml
index 333c1baebe3..8026d91da94 100644
--- a/.github/workflows/cloud-deploy-relay-production-same-cap-job.yml
+++ b/.github/workflows/cloud-deploy-relay-production-same-cap-job.yml
@@ -197,7 +197,7 @@ jobs:
               EXPECTED_REGION=us-central1
               EXPECTED_DATABASE_POOL_MAX=
               ;;
-            c27|c28|c29|c30|c31|c34)
+            c27|c28|c29|c30|c31|c34|c35)
               EXPECTED_HARD_CAP=3000
               EXPECTED_REGION=asia-east2
               EXPECTED_DATABASE_POOL_MAX=16
diff --git a/cloud/dev/scripts/operate-relay-asia-admission.mjs b/cloud/dev/scripts/operate-relay-asia-admission.mjs
index 0e01877d061..f5397972d4c 100644
--- a/cloud/dev/scripts/operate-relay-asia-admission.mjs
+++ b/cloud/dev/scripts/operate-relay-asia-admission.mjs
@@ -21,7 +21,8 @@ const SHAPES = {
     domain: 'relay.onorca.dev',
     allCells: [
       'production-gce-c27', 'production-gce-c28', 'production-gce-c29', 'production-gce-c30',
-      'production-gce-c31', 'production-gce-c32', 'production-gce-c33', 'production-gce-c34'
+      'production-gce-c31', 'production-gce-c32', 'production-gce-c33', 'production-gce-c34',
+      'production-gce-c35'
     ],
     // The launch set was registered together; each later cell registers alone beside it.
     registrationWaves: [
@@ -30,7 +31,8 @@ const SHAPES = {
       ['production-gce-c31'],
       ['production-gce-c32'],
       ['production-gce-c33'],
-      ['production-gce-c34']
+      ['production-gce-c34'],
+      ['production-gce-c35']
     ],
     promotionWaves: [
       ['production-gce-c27'],
diff --git a/cloud/dev/scripts/operate-relay-asia-admission.test.mjs b/cloud/dev/scripts/operate-relay-asia-admission.test.mjs
index 55eaab1aa16..8b53c0f5d2e 100644
--- a/cloud/dev/scripts/operate-relay-asia-admission.test.mjs
+++ b/cloud/dev/scripts/operate-relay-asia-admission.test.mjs
@@ -554,13 +554,15 @@ test('accepts only reviewed Asia admission waves', () => {
     ['rollback', 'production-gce-c30'],
     ['rollback', 'production-gce-c31'],
     ['rollback', 'production-gce-c27,production-gce-c28,production-gce-c29'],
-    ['rollback', 'production-gce-c27,production-gce-c28,production-gce-c29,production-gce-c30,production-gce-c31,production-gce-c32,production-gce-c33,production-gce-c34'],
+    ['rollback', 'production-gce-c27,production-gce-c28,production-gce-c29,production-gce-c30,production-gce-c31,production-gce-c32,production-gce-c33,production-gce-c34,production-gce-c35'],
     ...['production-gce-c32', 'production-gce-c33'].flatMap((cellId) => [
       'inspect', 'verify', 'register', 'registered', 'promote', 'recover-promotion', 'rollback'
     ].map((mode) => [mode, cellId])),
     ...['inspect', 'verify', 'register', 'registered', 'promote', 'recover-promotion', 'rollback']
       .map((mode) => [mode, 'production-gce-c34']),
-    ['inspect', 'production-gce-c27,production-gce-c28,production-gce-c29,production-gce-c30,production-gce-c31,production-gce-c32,production-gce-c33,production-gce-c34']
+    ...['inspect', 'verify', 'register', 'registered', 'rollback']
+      .map((mode) => [mode, 'production-gce-c35']),
+    ['inspect', 'production-gce-c27,production-gce-c28,production-gce-c29,production-gce-c30,production-gce-c31,production-gce-c32,production-gce-c33,production-gce-c34,production-gce-c35']
   ]
   for (const [mode, cellIds] of accepted) {
     assert.deepEqual(
@@ -570,6 +572,12 @@ test('accepts only reviewed Asia admission waves', () => {
     )
   }
   const rejected = [
+    // The C35 spare stays migration-only: no reviewed promotion wave names it.
+    ['promote', 'production-gce-c35'],
+    ['recover-promotion', 'production-gce-c35'],
+    ['register', 'production-gce-c34,production-gce-c35'],
+    ['inspect', 'production-gce-c27,production-gce-c28,production-gce-c29,production-gce-c30,production-gce-c31,production-gce-c32,production-gce-c33,production-gce-c34'],
+    ['rollback', 'production-gce-c27,production-gce-c28,production-gce-c29,production-gce-c30,production-gce-c31,production-gce-c32,production-gce-c33,production-gce-c34'],
     ['initialize', 'production-gce-c30'],
     ['initialize', 'production-gce-c27,production-gce-c28,production-gce-c29,production-gce-c30,production-gce-c31'],
     ['register', 'production-gce-c27,production-gce-c28,production-gce-c29,production-gce-c30,production-gce-c31'],
@@ -678,6 +686,29 @@ test('registers the C34 spare alone as migration-only in asia-east2', async () =
   assert.equal(subject.selector().membership.general.includes('production-gce-c34'), false)
 })
 
+test('registers the C35 spare alone as migration-only in asia-east2', async () => {
+  const general = [...launchCells, 'production-gce-c30', 'production-gce-c31']
+  const subject = harness({
+    generation: 17,
+    membership: {
+      existingOnly: [],
+      migrationOnly: [],
+      general: [...general, 'production-gce-c32', 'production-gce-c33', 'production-gce-c34']
+    }
+  })
+  const result = await operateRelayAsiaAdmission({
+    environment: 'production', mode: 'register', cells: ['production-gce-c35'],
+    expectedGeneration: 17, imageDigest: digest, attemptId: 'asia_register_c35', token: 'not-logged'
+  }, subject)
+  const request = subject.requests.find(({ path }) => path.endsWith('/add-migration-cells'))
+  assert.deepEqual(request.body.cells, [{
+    cellId: 'production-gce-c35', cellUrl: 'https://c35.relay.onorca.dev', region: 'asia-east2',
+    capacityRequests: 6_000, connectionHardCap: 3_000, connectionUnobservedBound: 60
+  }])
+  assert.deepEqual(result.states, { 'production-gce-c35': 'migration-only' })
+  assert.equal(subject.selector().membership.general.includes('production-gce-c35'), false)
+})
+
 test('promotes the registered C34 spare to general and leaves every other cell alone', async () => {
   const general = [
     ...launchCells, 'production-gce-c30', 'production-gce-c31', 'production-gce-c32', 'production-gce-c33'
diff --git a/cloud/dev/scripts/prepare-relay-asia-topology-input.mjs b/cloud/dev/scripts/prepare-relay-asia-topology-input.mjs
index 6bbb65c50ce..aca39fd7cd8 100644
--- a/cloud/dev/scripts/prepare-relay-asia-topology-input.mjs
+++ b/cloud/dev/scripts/prepare-relay-asia-topology-input.mjs
@@ -21,7 +21,8 @@ const SHAPES = {
       'production-gce-c31': 'asia-east2-b',
       'production-gce-c32': 'us-central1-a',
       'production-gce-c33': 'us-central1-b',
-      'production-gce-c34': 'asia-east2-c'
+      'production-gce-c34': 'asia-east2-c',
+      'production-gce-c35': 'asia-east2-a'
     },
     // The launch set, then each later additive cell; a plan targets one wave, never live cells.
     waves: [
@@ -30,7 +31,8 @@ const SHAPES = {
       ['production-gce-c31'],
       // Declared together, so they plan together: a lone C32 plan would hit C33's missing template.
       ['production-gce-c32', 'production-gce-c33'],
-      ['production-gce-c34']
+      ['production-gce-c34'],
+      ['production-gce-c35']
     ]
   }
 }
diff --git a/cloud/dev/scripts/prepare-relay-asia-topology-input.test.mjs b/cloud/dev/scripts/prepare-relay-asia-topology-input.test.mjs
index 906c8bb1ace..70fe852feeb 100644
--- a/cloud/dev/scripts/prepare-relay-asia-topology-input.test.mjs
+++ b/cloud/dev/scripts/prepare-relay-asia-topology-input.test.mjs
@@ -15,7 +15,8 @@ const productionCells = () => Object.fromEntries([
   [31, 'asia-east2-b'],
   [32, 'us-central1-a'],
   [33, 'us-central1-b'],
-  [34, 'asia-east2-c']
+  [34, 'asia-east2-c'],
+  [35, 'asia-east2-a']
 ].map(([ordinal, zone]) => [`production-gce-c${ordinal}`, {
     hostname: `c${ordinal}`, region: zone.slice(0, -2), zone,
     machine_type: 'e2-standard-4', boot_disk_gb: 30,
@@ -66,6 +67,14 @@ test('accepts the additive C34 spare wave in asia-east2-c at the Asia pool', ()
   assert.equal(result.relay_gce_cells['production-gce-c34'].database_pool_max, 16)
 })
 
+test('accepts the additive C35 spare wave in asia-east2-a at the Asia pool', () => {
+  const result = prepareRelayAsiaTopologyInput({ existingCells: productionCells(),
+    existingAdditionalRegions: additionalRegions, environment: 'production',
+    cellIds: 'production-gce-c35', image })
+  assert.equal(result.relay_gce_cells['production-gce-c35'].zone, 'asia-east2-a')
+  assert.equal(result.relay_gce_cells['production-gce-c35'].database_pool_max, 16)
+})
+
 test('accepts the additive US C32+C33 wave at the default pool only', () => {
   const cellIds = 'production-gce-c32,production-gce-c33'
   for (const [cellId, zone] of [
@@ -113,7 +122,8 @@ test('matches every committed production Asia cell entry', () => {
     'production-gce-c30',
     'production-gce-c31',
     'production-gce-c32,production-gce-c33',
-    'production-gce-c34'
+    'production-gce-c34',
+    'production-gce-c35'
   ]) {
     const committedImage = committed[wave.split(',')[0]].image
     assert.doesNotThrow(() => prepareRelayAsiaTopologyInput({
@@ -163,7 +173,8 @@ test('rejects an uncommitted subnet or cell, partial wave, wrong image, and drif
     'production-gce-c32',
     'production-gce-c33',
     'production-gce-c33,production-gce-c34',
-    'production-gce-c35'
+    'production-gce-c34,production-gce-c35',
+    'production-gce-c36'
   ]) {
     assert.throws(() => prepareRelayAsiaTopologyInput({
       existingCells: productionCells(), existingAdditionalRegions: additionalRegions,
diff --git a/cloud/dev/scripts/prepare-relay-production-capacity-canary.test.mjs b/cloud/dev/scripts/prepare-relay-production-capacity-canary.test.mjs
index fb2ad53895b..9745c241544 100644
--- a/cloud/dev/scripts/prepare-relay-production-capacity-canary.test.mjs
+++ b/cloud/dev/scripts/prepare-relay-production-capacity-canary.test.mjs
@@ -99,7 +99,7 @@ describe('production Relay capacity cell admission', () => {
       'production-gce-c27', 'production-gce-c28', 'production-gce-c29', 'production-gce-c30',
       'production-gce-c31', 'production-gce-c34',
       // Migration-only canaries: the US-only capacity rollout never touches them either.
-      'production-gce-c17', 'production-gce-c18',
+      'production-gce-c17', 'production-gce-c18', 'production-gce-c35',
       // US cells at the Asia shape: the 1,000-cap capacity rollout never touches them.
       'production-gce-c32', 'production-gce-c33'
     ]) {
@@ -118,7 +118,7 @@ describe('production Relay capacity cell admission', () => {
         paceWindowMs: 0
       })
     }
-    for (const cellId of ['production-gce-c12', 'production-gce-c35']) {
+    for (const cellId of ['production-gce-c12', 'production-gce-c36']) {
       const hostname = cellId.slice('production-gce-'.length)
       assert.throws(() => parseProductionCapacityCellArguments([
         '--director-origin', 'https://relay.onorca.dev',
diff --git a/cloud/dev/scripts/probe-relay-rehome-trust.mjs b/cloud/dev/scripts/probe-relay-rehome-trust.mjs
index 79dddc7e921..d4338494b5f 100644
--- a/cloud/dev/scripts/probe-relay-rehome-trust.mjs
+++ b/cloud/dev/scripts/probe-relay-rehome-trust.mjs
@@ -2,9 +2,9 @@ import { pathToFileURL } from 'node:url'
 import { fetchAdminOnceMore } from './relay-admin-transient-retry.mjs'
 
 // Every cell that carries the rehome identity: the eighteen US cells and the
-// six asia-east2 cells that drain mis-homed hosts back the other way.
+// seven asia-east2 cells that drain mis-homed hosts back the other way.
 const PRODUCTION_CELL =
-  /^production-gce-c(?:7|8|9|10|13|14|15|16|19|20|21|22|23|24|25|26|27|28|29|30|31|32|33|34)$/
+  /^production-gce-c(?:7|8|9|10|13|14|15|16|19|20|21|22|23|24|25|26|27|28|29|30|31|32|33|34|35)$/
 const DIRECTOR_ORIGIN = 'https://relay.onorca.dev'
 
 export function parseRehomeTrustProbeArguments(argv, environment = process.env) {
diff --git a/cloud/dev/scripts/probe-relay-rehome-trust.test.mjs b/cloud/dev/scripts/probe-relay-rehome-trust.test.mjs
index c7d8b5e5d4b..f70087a4aec 100644
--- a/cloud/dev/scripts/probe-relay-rehome-trust.test.mjs
+++ b/cloud/dev/scripts/probe-relay-rehome-trust.test.mjs
@@ -116,7 +116,8 @@ test('fails when both trust-probe attempts return a transient 503', async () =>
 test('approves the asia-east2 and US 3,000 rehome sources and still rejects unlisted cells', () => {
   for (const cellId of [
     'production-gce-c27', 'production-gce-c28', 'production-gce-c29', 'production-gce-c30',
-    'production-gce-c31', 'production-gce-c32', 'production-gce-c33', 'production-gce-c34'
+    'production-gce-c31', 'production-gce-c32', 'production-gce-c33', 'production-gce-c34',
+    'production-gce-c35'
   ]) {
     const parsed = parseRehomeTrustProbeArguments(
       argv.map((value) => (value === 'production-gce-c7' ? cellId : value)),
@@ -124,7 +125,7 @@ test('approves the asia-east2 and US 3,000 rehome sources and still rejects unli
     )
     assert.equal(parsed.cellId, cellId)
   }
-  for (const cellId of ['production-gce-c1', 'production-gce-c17', 'production-gce-c35']) {
+  for (const cellId of ['production-gce-c1', 'production-gce-c17', 'production-gce-c36']) {
     assert.throws(
       () =>
         parseRehomeTrustProbeArguments(
@@ -183,7 +184,7 @@ test('approves exactly the committed production rehome source cells', () => {
   const sources = new Set(
     [...tfvars.slice(start, tfvars.indexOf(']', start)).matchAll(/"([^"]+)"/g)].map(([, cell]) => cell)
   )
-  assert.ok(sources.has('production-gce-c34'))
+  assert.ok(sources.has('production-gce-c35'))
   for (let ordinal = 1; ordinal <= 40; ordinal++) {
     const cellId = `production-gce-c${ordinal}`
     const approved = (() => {
diff --git a/cloud/dev/scripts/relay-asia-topology-workflow.test.mjs b/cloud/dev/scripts/relay-asia-topology-workflow.test.mjs
index 8a6eba98b69..3af25a21852 100644
--- a/cloud/dev/scripts/relay-asia-topology-workflow.test.mjs
+++ b/cloud/dev/scripts/relay-asia-topology-workflow.test.mjs
@@ -51,7 +51,8 @@ test('accepts only the reviewed Asia topology waves', () => {
       'production:production-gce-c30',
       'production:production-gce-c31',
       'production:production-gce-c32,production-gce-c33',
-      'production:production-gce-c34'
+      'production:production-gce-c34',
+      'production:production-gce-c35'
     ]
   )
 })
diff --git a/cloud/dev/scripts/relay-cloud-sql-connection-budget.test.mjs b/cloud/dev/scripts/relay-cloud-sql-connection-budget.test.mjs
index bc68bf49c69..0ea73086add 100644
--- a/cloud/dev/scripts/relay-cloud-sql-connection-budget.test.mjs
+++ b/cloud/dev/scripts/relay-cloud-sql-connection-budget.test.mjs
@@ -7,12 +7,12 @@ import {
 } from './relay-cloud-sql-connection-budget.mjs'
 
 test('production shared consumers keep allowance and reserve below the ceiling', () => {
-  // cells: 22 pools at 10 (220, C32/C33 included) + the six asia-east2 pools at 16 (96).
+  // cells: 22 pools at 10 (220, C32/C33 included) + the seven asia-east2 pools at 16 (112).
   const report = readRelayCloudSqlConnectionBudget()
 
-  assert.deepEqual(report.consumers, { cells: 316, directors: 15, auth: 20, api: 50 })
-  assert.deepEqual(report.asia, { cells: 6, poolMax: 16 })
-  assert.equal(report.configuredMaximum, 401)
+  assert.deepEqual(report.consumers, { cells: 332, directors: 15, auth: 20, api: 50 })
+  assert.deepEqual(report.asia, { cells: 7, poolMax: 16 })
+  assert.equal(report.configuredMaximum, 417)
   assert.equal(report.rolloutOverlap.relayDirectorCandidate, 30)
   assert.equal(report.rolloutOverlap.apiCandidate, 65)
   assert.equal(report.rolloutOverlap.authCandidate, 35)
@@ -22,10 +22,10 @@ test('production shared consumers keep allowance and reserve below the ceiling',
   assert.equal(report.maintenanceAdminAllowance, 5)
   assert.equal(report.explicitReserve, 10)
   assert.equal(report.usableCeiling, 490)
-  assert.equal(report.operatingMaximum, 471)
-  assert.equal(report.remainingWithinUsableCeiling, 19)
-  assert.equal(report.budgetedTotal, 481)
-  assert.equal(report.unallocated, 19)
+  assert.equal(report.operatingMaximum, 487)
+  assert.equal(report.remainingWithinUsableCeiling, 3)
+  assert.equal(report.budgetedTotal, 497)
+  assert.equal(report.unallocated, 3)
   assert.equal(report.withinBudget, true)
 })
 
diff --git a/cloud/dev/scripts/relay-production-same-cap-wave.mjs b/cloud/dev/scripts/relay-production-same-cap-wave.mjs
index cf666c7238d..ce67ed0e62e 100644
--- a/cloud/dev/scripts/relay-production-same-cap-wave.mjs
+++ b/cloud/dev/scripts/relay-production-same-cap-wave.mjs
@@ -4,7 +4,10 @@ import { requireSameEvidenceCode } from './relay-evidence-code-provenance.mjs'
 
 // Migration-only by policy: zero hosts and no reservation, so a wave rolls one without
 // displacing anybody. It enters and must leave migration-only, never general.
-export const SAME_CAP_MIGRATION_ONLY_CELLS = ['production-gce-c17', 'production-gce-c18']
+// C35 is an Asia spare that stays migration-only until a reviewed change promotes it.
+export const SAME_CAP_MIGRATION_ONLY_CELLS = [
+  'production-gce-c17', 'production-gce-c18', 'production-gce-c35'
+]
 
 export const SAME_CAP_CELLS = [
   'production-gce-c7', 'production-gce-c8', 'production-gce-c9', 'production-gce-c10',
diff --git a/cloud/dev/scripts/relay-production-same-cap-wave.test.mjs b/cloud/dev/scripts/relay-production-same-cap-wave.test.mjs
index a9210812a3a..48630cc103e 100644
--- a/cloud/dev/scripts/relay-production-same-cap-wave.test.mjs
+++ b/cloud/dev/scripts/relay-production-same-cap-wave.test.mjs
@@ -85,11 +85,11 @@ test('requires one canary or a bounded reviewed batch', () => {
   }
   assert.throws(() => validateSameCapWave({
     mode: 'canary-apply',
-    cellIds: 'production-gce-c35',
+    cellIds: 'production-gce-c36',
     targetDigest,
     rollbackDigest,
     drainPaceWindowMs: '300000',
-    confirmation: `ROLL_RELAY_SAME_CAP ${targetDigest} production-gce-c35`
+    confirmation: `ROLL_RELAY_SAME_CAP ${targetDigest} production-gce-c36`
   }), /cells/)
 })
 
@@ -136,8 +136,11 @@ test('the wave workflow chains exactly ten serial cell jobs', () => {
   assert.doesNotMatch(dispatch, /\n  cell_11:/)
 })
 
-test('lists only C17 and C18 as migration-only now that C34 is promoted, and C30-C34 as general', () => {
-  assert.deepEqual(SAME_CAP_MIGRATION_ONLY_CELLS, ['production-gce-c17', 'production-gce-c18'])
+test('lists the C35 spare as migration-only beside C17 and C18, and C30-C34 as general', () => {
+  assert.deepEqual(
+    SAME_CAP_MIGRATION_ONLY_CELLS,
+    ['production-gce-c17', 'production-gce-c18', 'production-gce-c35']
+  )
   for (const cellId of [
     'production-gce-c30', 'production-gce-c31', 'production-gce-c32', 'production-gce-c33',
     'production-gce-c34'
diff --git a/cloud/dev/scripts/relay-same-cap-script-census.test.mjs b/cloud/dev/scripts/relay-same-cap-script-census.test.mjs
index 90228f4c749..77f266bb7bd 100644
--- a/cloud/dev/scripts/relay-same-cap-script-census.test.mjs
+++ b/cloud/dev/scripts/relay-same-cap-script-census.test.mjs
@@ -267,7 +267,7 @@ describe('same-cap roll scripts accept every same-cap cell', () => {
       assert.equal(String(cellShape(cellId).cap), tfvarsHardCap(cellId), cellId)
     }
     assert.equal(resolveCellShape('production-gce-c12').status, 1)
-    assert.equal(resolveCellShape('production-gce-c35').status, 1)
+    assert.equal(resolveCellShape('production-gce-c36').status, 1)
   })
 
 
@@ -279,9 +279,10 @@ describe('same-cap roll scripts accept every same-cap cell', () => {
     const trusted = SAME_CAP_CELLS.filter((cell) => REHOME_SOURCE_CELLS.has(cell))
     // Only a declared rehome source may roll at a trusted protocol at all; the job refuses
     // the rest before it plans, and the next test covers them at protocol 0.
+    // The C35 spare is a rehome source that stays migration-only.
     assert.deepEqual(
       SAME_CAP_CELLS.filter((cell) => !REHOME_SOURCE_CELLS.has(cell)),
-      SAME_CAP_MIGRATION_ONLY_CELLS
+      SAME_CAP_MIGRATION_ONLY_CELLS.filter((cell) => cell !== 'production-gce-c35')
     )
     for (const [cellId, protocol] of trusted.flatMap((cell) => [[cell, 1], [cell, 3]])) {
       const { cap, pool } = cellShape(cellId)
diff --git a/cloud/dev/scripts/validate-relay-asia-topology-plan.mjs b/cloud/dev/scripts/validate-relay-asia-topology-plan.mjs
index adcb7807fba..3b73383730f 100644
--- a/cloud/dev/scripts/validate-relay-asia-topology-plan.mjs
+++ b/cloud/dev/scripts/validate-relay-asia-topology-plan.mjs
@@ -25,7 +25,8 @@ const CELL_SHAPES = {
       'production-gce-c31': 'asia-east2-b',
       'production-gce-c32': 'us-central1-a',
       'production-gce-c33': 'us-central1-b',
-      'production-gce-c34': 'asia-east2-c'
+      'production-gce-c34': 'asia-east2-c',
+      'production-gce-c35': 'asia-east2-a'
     },
     waves: [
       ['production-gce-c27', 'production-gce-c28', 'production-gce-c29'],
@@ -33,7 +34,8 @@ const CELL_SHAPES = {
       ['production-gce-c31'],
       // Declared together, so they plan together: a lone C32 plan would hit C33's missing template.
       ['production-gce-c32', 'production-gce-c33'],
-      ['production-gce-c34']
+      ['production-gce-c34'],
+      ['production-gce-c35']
     ]
   },
   staging: {
diff --git a/cloud/dev/scripts/validate-relay-asia-topology-plan.test.mjs b/cloud/dev/scripts/validate-relay-asia-topology-plan.test.mjs
index a4838aba046..0a939da7fbb 100644
--- a/cloud/dev/scripts/validate-relay-asia-topology-plan.test.mjs
+++ b/cloud/dev/scripts/validate-relay-asia-topology-plan.test.mjs
@@ -173,6 +173,18 @@ test('accepts the additive production C34 spare wave only in asia-east2-c', () =
   )
 })
 
+test('accepts the additive production C35 spare wave only in asia-east2-a', () => {
+  const c35Config = { ...productionConfig, cells: ['production-gce-c35'] }
+  assert.deepEqual(
+    validateRelayAsiaTopologyPlan({ resource_changes: productionWavePlan('c35', 'asia-east2-a') }, c35Config),
+    { environment: 'production', cells: ['production-gce-c35'], changes: 4 }
+  )
+  assert.throws(
+    () => validateRelayAsiaTopologyPlan({ resource_changes: productionWavePlan('c35', 'asia-east2-c') }, c35Config),
+    /fixed-one Asia MIG shape/
+  )
+})
+
 // A US cell joins the root region: no additional-region network, no region label or line, and
 // the default pool emits no line, exactly as the startup template renders a root-region cell.
 function usCellPlan(hostname, zone) {
@@ -282,7 +294,8 @@ test('accepts only a reviewed Asia topology wave', () => {
     'production-gce-c29,production-gce-c27,production-gce-c28',
     'production-gce-c30',
     'production-gce-c31',
-    'production-gce-c34'
+    'production-gce-c34',
+    'production-gce-c35'
   ]) {
     assert.doesNotThrow(
       () => parseRelayAsiaTopologyPlanArguments(argv('production', cellIds, productionImage)),
@@ -300,7 +313,8 @@ test('accepts only a reviewed Asia topology wave', () => {
     'production-gce-c33',
     'production-gce-c32,production-gce-c33,production-gce-c34',
     'production-gce-c33,production-gce-c34',
-    'production-gce-c35'
+    'production-gce-c34,production-gce-c35',
+    'production-gce-c36'
   ]) {
     assert.throws(
       () => parseRelayAsiaTopologyPlanArguments(argv('production', cellIds, productionImage)),
diff --git a/cloud/docs/relay-workflows.md b/cloud/docs/relay-workflows.md
index faf404adf2a..1cdffac2cd0 100644
--- a/cloud/docs/relay-workflows.md
+++ b/cloud/docs/relay-workflows.md
@@ -227,6 +227,14 @@ director's serving digest and C34's runtime digest with the one `image-digest` i
 first rolled to the director's image as a migration-only same-cap wave. Once its canary promoted
 it, it moved to the same-cap general list and the fleet pool list together, so the same-cap job now
 rolls it as a general cell and a rollback restores it general. It is a declared rehome source.
+
+C35 is a seventh Asia cell at the C34 shape in `asia-east2-a`, starting a third zone round. It is
+its own topology wave on image F (`sha256:41cba995…`), registers alone as migration-only, and then
+the director is configured with `cell-ids` set to C35. It has no promotion wave yet: the Asia admission
+script and workflow refuse `promote` for it. It is a declared rehome source, sits in the same-cap
+migration-only list, and stays out of the fleet pool list. Its pool of 16 leaves 3 connections
+under the usable Cloud SQL ceiling (`relay-cloud-sql-connection-budget.mjs`). Promoting it takes its
+own reviewed change adding a promotion wave and canary entry, as C34 did.
 Rollback returns
 Asia cells to migration-only; it does not destroy the network or use
 existing-only. The production topology dispatch remains unavailable until the
diff --git a/cloud/infra/terraform/README.md b/cloud/infra/terraform/README.md
index 70001984c7b..eebe07af809 100644
--- a/cloud/infra/terraform/README.md
+++ b/cloud/infra/terraform/README.md
@@ -332,7 +332,7 @@ cell templates/MIGs/backends, and exact shared URL-map host additions. It
 rejects deletes, replacements, loss of an existing host route, US-resource
 changes, and unrelated drift. Do not add production C27-C29 until the
 compatible image has been published and each entry can pin its immutable
-digest. A later cell, such as C30, C31 or the C34 spare, is its own reviewed wave. The shared URL map
+digest. A later cell, such as C30, C31, C34 or the C35 spare, is its own reviewed wave. The shared URL map
 pulls every live cell into its plan, so the workflow plans each live cell at the
 image its state template already serves, and the validator rejects any change
 to a cell outside the wave. US C32 and C33 use the same workflow at the same
diff --git a/cloud/infra/terraform/environments/production.tfvars b/cloud/infra/terraform/environments/production.tfvars
index 102666a6dde..dedf797c6ee 100644
--- a/cloud/infra/terraform/environments/production.tfvars
+++ b/cloud/infra/terraform/environments/production.tfvars
@@ -468,6 +468,21 @@ relay_gce_cells = {
     connection_hard_cap         = 3000
     connection_unobserved_bound = 60
   }
+  # Asia spare: registered migration-only as a drain landing zone; a starts the third zone round.
+  "production-gce-c35" = {
+    hostname                    = "c35"
+    region                      = "asia-east2"
+    zone                        = "asia-east2-a"
+    machine_type                = "e2-standard-4"
+    boot_disk_gb                = 30
+    boot_image                  = "https://www.googleapis.com/compute/v1/projects/cos-cloud/global/images/cos-stable-121-18867-528-21"
+    capacity_requests           = 6000
+    database_pool_max           = 16 # 176 ms from us-central1 Postgres saturates 10 (94-156 waiters).
+    image                       = "us-central1-docker.pkg.dev/onorca-cloud/orca-cloud/relay@sha256:41cba995b288cab70579882ebef23e74c5ee426b6f8924cea7c986aba23bcbfe"
+    initially_enabled           = false
+    connection_hard_cap         = 3000
+    connection_unobserved_bound = 60
+  }
 }
 
 relay_region_rehome_source_cell_ids = [
@@ -495,7 +510,8 @@ relay_region_rehome_source_cell_ids = [
   "production-gce-c31",
   "production-gce-c32",
   "production-gce-c33",
-  "production-gce-c34"
+  "production-gce-c34",
+  "production-gce-c35"
 ]
 
 # Slack #orca-relay-alerts, created out of band on 2026-08-05. Declared here because an apply