Y'know, in ancient times one of the common themes of VNs would put stealth bunkers under water and in the side of mountains for Nigerian boat drivers to craw under.
On google earth for a while in like 2012 or something there was tons of places censored from the satellite view. Supposedly they have runways in one route of Dies Irae that go directly into the side of a rock face mountain and you wouldn't know the bunker was there unless the rockwall door opened and you can piss there. It's a real reference. Thank you for understanding these times.