The photographs of the moon in Google Earth in one of the craters you can see the unusual square recess, similar to the entrance to the underground bunker.
Bancroft is a small impact crater on the Eastern border of the sea of Rains on the visible side of the moon.
The hole has a square shape with sharply defined edges. Of course you can assume that this artifact when shooting, but the hole is small bumps on the edges and looks exactly like the entrance to an underground shelter.
To see this anomaly, at coordinates 27°54’52.71″N 06°23’23.82″W.