diff --git a/scripts/firebase-admin/migrateHearingTranscription.ts b/scripts/firebase-admin/migrateHearingTranscription.ts
new file mode 100644
index 000000000..910ba3943
--- /dev/null
+++ b/scripts/firebase-admin/migrateHearingTranscription.ts
@@ -0,0 +1,245 @@
+import * as admin from "firebase-admin"
+import { Number, Record, String } from "runtypes"
+import { Script } from "./types"
+import { Timestamp } from "../../functions/src/firebase"
+
+function getDevServiceAccount(path: string) {
+  return require(path)
+}
+
+// Initialize source (dev) Firebase
+function initDevApp(devServiceAccountPath: string) {
+  const devServiceAccount = getDevServiceAccount(devServiceAccountPath)
+  return admin.initializeApp(
+    {
+      credential: admin.credential.cert(devServiceAccount)
+    },
+    "dev"
+  )
+}
+
+function convertTimestamps(obj: any): any {
+  if (obj instanceof Timestamp) {
+    return obj
+  } else if (
+    obj &&
+    typeof obj === "object" &&
+    typeof obj._seconds === "number" &&
+    typeof obj._nanoseconds === "number"
+  ) {
+    // Convert plain object to admin Timestamp
+    return Timestamp.fromMillis(obj._seconds * 1000 + obj._nanoseconds / 1e6)
+  } else if (Array.isArray(obj)) {
+    return obj.map(convertTimestamps)
+  } else if (obj && typeof obj === "object") {
+    return Object.fromEntries(
+      Object.entries(obj).map(([k, v]) => [k, convertTimestamps(v)])
+    )
+  }
+  return obj
+}
+
+const Args = Record({
+  sourceProject: String,
+  hearing: Number.optional()
+})
+
+export const script: Script = async ({ db, args }) => {
+  const { sourceProject, hearing } = Args.check(args)
+  if (!sourceProject) {
+    console.error(
+      "Please provide the path to the dev service account JSON file as an argument."
+    )
+    process.exit(1)
+  }
+
+  // Clear emulator environment variables to avoid connecting to emulators when creating secondary instance
+  delete process.env.FIRESTORE_EMULATOR_HOST
+  delete process.env.FIREBASE_AUTH_EMULATOR_HOST
+  delete process.env.FIREBASE_STORAGE_EMULATOR_HOST
+
+  // Initialize dev app and db (digital-testimony-dev)
+  const devApp = initDevApp(sourceProject)
+  const devDb = devApp.firestore()
+
+  // For single hearing migration
+  if (hearing) {
+    const hearingId = "hearing-" + hearing
+    console.log(`Processing single hearing: ${hearingId}`)
+    const devHearingsSnapshot = await devDb
+      .collection("events")
+      .doc(hearingId)
+      .get()
+
+    if (!devHearingsSnapshot.exists) {
+      console.error(`Hearing ${hearingId} not found in dev project.`)
+      return
+    }
+    const devData = devHearingsSnapshot.data()
+
+    if (!devData?.videoTranscriptionId) {
+      console.log(`Hearing ${hearingId} has no transcription to migrate.`)
+      return
+    }
+    const targetDoc = await db.collection("events").doc(hearingId).get()
+    const targetData = targetDoc.exists ? targetDoc.data() : null
+
+    // Only migrate if hearing in target environment does not have a transcription yet
+    if (!targetData?.videoTranscriptionId) {
+      const transcriptionId = devData.videoTranscriptionId
+      const devTranscriptionDoc = await devDb
+        .collection("transcriptions")
+        .doc(transcriptionId)
+        .get()
+
+      const devTranscriptionData = devTranscriptionDoc.exists
+        ? devTranscriptionDoc.data()
+        : null
+
+      if (devTranscriptionData) {
+        // Create transcription in target project instead of setting, in case it already exists, which will throw an error
+        const convertedData = convertTimestamps(devTranscriptionData)
+        try {
+          console.log(`Creating transcription ${transcriptionId}...`)
+          await db
+            .collection("transcriptions")
+            .doc(transcriptionId)
+            .create(convertedData)
+        } catch (err) {
+          console.error(`Error creating transcription ${transcriptionId}:`, err)
+          return
+        }
+
+        const subcollections = await devTranscriptionDoc.ref.listCollections()
+        for (const subcol of subcollections) {
+          const docs = await subcol.get()
+          for (const doc of docs.docs) {
+            await db
+              .collection("transcriptions")
+              .doc(transcriptionId)
+              .collection(subcol.id)
+              .doc(doc.id)
+              .set(doc.data())
+          }
+        }
+      } else {
+        console.error(
+          `Transcription ${transcriptionId} not found in dev project.`
+        )
+      }
+
+      await db
+        .collection("events")
+        .doc(hearingId)
+        .update({
+          videoURL: devData.videoURL,
+          videoFetchedAt: convertTimestamps(devData.videoFetchedAt),
+          videoTranscriptionId: devData.videoTranscriptionId
+        })
+      console.log(`Migration complete for hearing ${hearingId}.`)
+    }
+  } else {
+    // For full migration
+    const devHearingsSnapshot = await devDb
+      .collection("events")
+      .where("type", "==", "hearing")
+      .get()
+
+    const limit = 100
+    let migrated = 0,
+      skipped = 0,
+      failed = 0
+
+    const bulkWriter = db.bulkWriter()
+
+    for (const devDoc of devHearingsSnapshot.docs) {
+      if (migrated >= limit) {
+        console.log(`Migration limit of ${limit} reached. Stopping.`)
+        break
+      }
+      const devData = devDoc.data()
+      if (!devData.videoTranscriptionId) {
+        skipped++
+        console.log(`${devDoc.id} has no transcription to migrate.`)
+        continue
+      }
+
+      const targetDoc = await db.collection("events").doc(devDoc.id).get()
+      const targetData = targetDoc.exists ? targetDoc.data() : null
+
+      if (!targetData) {
+        skipped++
+        console.log(`${devDoc.id} not found in target project.`)
+        continue
+      }
+
+      // Only migrate if hearing in target environment does not have a transcription yet
+      if (!targetData?.videoTranscriptionId) {
+        console.log(`Migrating ${devDoc.id}...`)
+        const transcriptionId = devData.videoTranscriptionId
+        const devTranscriptionDoc = await devDb
+          .collection("transcriptions")
+          .doc(transcriptionId)
+          .get()
+
+        const devTranscriptionData = devTranscriptionDoc.exists
+          ? devTranscriptionDoc.data()
+          : null
+
+        if (devTranscriptionData) {
+          // Create transcription in target project instead of setting, in case it already exists, which will throw an error
+          const convertedData = convertTimestamps(devTranscriptionData)
+          try {
+            console.log(`Creating transcription ${transcriptionId}...`)
+            bulkWriter.create(
+              db.collection("transcriptions").doc(transcriptionId),
+              convertedData
+            )
+          } catch (err) {
+            failed++
+            console.error(
+              `Error creating transcription ${transcriptionId}:`,
+              err
+            )
+            continue
+          }
+
+          const subcollections = await devTranscriptionDoc.ref.listCollections()
+          for (const subcol of subcollections) {
+            const docs = await subcol.get()
+            for (const doc of docs.docs) {
+              await db
+                .collection("transcriptions")
+                .doc(transcriptionId)
+                .collection(subcol.id)
+                .doc(doc.id)
+                .set(doc.data())
+            }
+          }
+        } else {
+          failed++
+          console.error(
+            `Transcription ${transcriptionId} not found in dev project.`
+          )
+          continue
+        }
+
+        console.log(`Updating ${devDoc.id}...`)
+        bulkWriter.update(db.collection("events").doc(devDoc.id), {
+          videoURL: devData.videoURL,
+          videoFetchedAt: convertTimestamps(devData.videoFetchedAt),
+          videoTranscriptionId: devData.videoTranscriptionId
+        })
+        migrated++
+      } else {
+        console.log(`${devDoc.id} already has a transcription, skipping.`)
+        skipped++
+      }
+    }
+
+    await bulkWriter.close()
+    console.log(
+      `Migration complete. Migrated: ${migrated}, Skipped: ${skipped}, Failed: ${failed}`
+    )
+  }
+}