Still more massive St Thomas, Virgin Islands abandoned underground military bunkers. These latest were reclaimed and are operated by FEMA! Hard to find any other references to them online.
Note the FEMA reference to "continuity of operations" as a purpose of reclaiming the massive, abandoned underground military bunker complex.
https://web.archive.org/web/20190728230101/https://nara.getarchive.net/media/severe-storm-saint-thomas-us-virgin-islands-august-3-2011-the-bunker-is-a-complex-88fa74
https://web.archive.org/web/20190728230248/https://nara.getarchive.net/media/severe-storm-saint-thomas-us-virgin-islands-august-3-2011-the-bunker-is-a-complex-9d31b3
https://web.archive.org/web/20190728230511/https://nara.getarchive.net/media/severe-storm-saint-thomas-us-virgin-islands-august-3-2011-communications-specialist-0f012b