diff --git a/src/data/infrastructure.js b/src/data/infrastructure.js
index ea78494c8..348d4bfb4 100644
--- a/src/data/infrastructure.js
+++ b/src/data/infrastructure.js
@@ -1,15 +1,14 @@
 import { createLocalGeoJsonLayer } from './localGeojsonCore.js';
 import { INFRASTRUCTURE_DATA_URLS } from '../sources/infrastructureData.js';
 
-const datacentersUrl = INFRASTRUCTURE_DATA_URLS['local-datacenters'];
-const damsUrl = INFRASTRUCTURE_DATA_URLS['local-dams'];
-
 /**
  * Create fresh datacenter and dam layers without starting or loading them.
  * @param {object} services Caller-owned context, overlay and render operations.
  * @returns {object[]} Datacenters then dams, with stable standalone identities.
  */
 export function createInfrastructureLayers(services) {
+  const datacentersUrl = INFRASTRUCTURE_DATA_URLS['local-datacenters'];
+  const damsUrl = INFRASTRUCTURE_DATA_URLS['local-dams'];
   const datacenters = createLocalGeoJsonLayer(
     {
       id: 'local-datacenters',
diff --git a/src/layers/submarineCables/bundledSource.js b/src/layers/submarineCables/bundledSource.js
index 6aa0b70bb..881522ee9 100644
--- a/src/layers/submarineCables/bundledSource.js
+++ b/src/layers/submarineCables/bundledSource.js
@@ -1,14 +1,19 @@
 // This dataset is CC BY-NC-SA 3.0, not the project's MIT license.
 // Commercial users must remove it or obtain a TeleGeography license.
 // See DATA_SOURCES.md and the bundled dataset's source.json.
-const cableUrl = new URL(
-  '../../data/local_data/telegeography_submarine_cables/cable-geo.json',
-  import.meta.url,
-).href;
-const landingPointUrl = new URL(
-  '../../data/local_data/telegeography_submarine_cables/landing-point-geo.json',
-  import.meta.url,
-).href;
+// Resolved when read, so importing this module never needs a module URL.
+function cableUrl() {
+  return new URL(
+    '../../data/local_data/telegeography_submarine_cables/cable-geo.json',
+    import.meta.url,
+  ).href;
+}
+function landingPointUrl() {
+  return new URL(
+    '../../data/local_data/telegeography_submarine_cables/landing-point-geo.json',
+    import.meta.url,
+  ).href;
+}
 
 /** Supply GeoJSON collections without coupling the renderer to asset URLs. */
 export function createBundledCableSource({
@@ -33,8 +38,8 @@ export function createBundledCableSource({
     label: 'TeleGeography',
     async fetch(signal) {
       const [cables, landingPoints] = await Promise.all([
-        read(cableUrl, signal),
-        read(landingPointUrl, signal),
+        read(cableUrl(), signal),
+        read(landingPointUrl(), signal),
       ]);
       return { cables, landingPoints };
     },
diff --git a/src/sources/infrastructureData.js b/src/sources/infrastructureData.js
index 6936b9aa5..33206ab44 100644
--- a/src/sources/infrastructureData.js
+++ b/src/sources/infrastructureData.js
@@ -3,16 +3,19 @@
  * data files, line-delimited GeoJSON parsing and analyst records.
  */
 
-// Resolved by Vite in builds and relative to this module in other consumers.
+// Resolved by Vite in builds and relative to this module in other consumers,
+// when read, so importing this module never needs a module URL.
 export const INFRASTRUCTURE_DATA_URLS = Object.freeze({
-  'local-datacenters': new URL(
-    '../data/local_data/datacenters/datacenters.geojsonl',
-    import.meta.url,
-  ).href,
-  'local-dams': new URL(
-    '../data/local_data/dams/dams.geojsonl',
-    import.meta.url,
-  ).href,
+  get 'local-datacenters'() {
+    return new URL(
+      '../data/local_data/datacenters/datacenters.geojsonl',
+      import.meta.url,
+    ).href;
+  },
+  get 'local-dams'() {
+    return new URL('../data/local_data/dams/dams.geojsonl', import.meta.url)
+      .href;
+  },
 });
 
 /** Parse GeoJSON Lines: one Feature per non-empty line. */