Can't help but think it's related.
22 structures around one central structure.
If I'm correct, there's a cabal bunker under the tomb of the unknowns.
This would be an interim position for them. Collect there and then move out of the country to the long term bolt holes in Paraguay, antarctica or wherever.
Don't know if you could get a small sub up the Potomac, but that would be an ideal egress
That would be connected by tunnel to the Potomac. From there. you can slip into or out of the country relatively easily.
Maybe the tunnelfags will turn up something near the river.
Theory:
War breaks out with Russia/China/Ragheads or whoever.
DC to be tactically nuked=Sum of all fears
Cabal to Bunker under tomb of the Unknowns
Bunker connected by tunnel to Pentagon basin.
Cabal picked up by sub and exfiltrated
The Red October was hidden in the Potomac at the end
=The Hunt for Red October
Anon points at Naval Research lab who is sending a message that Arlington is closed.
That's the first step on their escape route.
Pentagon lagoon, not basin