| Clue | Source | Date |
|---|---|---|
| Underground bunker for tornado season | USA Today | 26 Feb 2025 |
| Subterranean shelter | USA Today | 21 Dec 2018 |
| Weather shelter | Universal | 03 Mar 2018 |
| Subterranean shelter | ||
| Underground violent-weather refuge | LA Times Daily | 03 Jan 2017 |
| Underground violent-weather refuge | ||
| Refuge during violent weather |