Location of discovery: Bancroft Crater, Earths Moon
Google Earth Coordinates: 27°54'52.71"N 6°23'23.82"W
I found this entrance to an underground alien base inside of Bancroft crater. The dark opening measures 70 meters by 50 meters exactly. The outer edges measure 114 meters by 114 meters. I used Google ruler to measure this, so it is their statistics. The base entrance is just outside the shadow of the crater, which means it was placed there deliberately to be in the light and make entering and exiting it with smaller ships much easier. Similar base entrance have been found before. For instance, a very similar entrance was found on Google Mars and was 160 meters across, but with similar design. (Click here to view the Mars entrance).
Scott C. Waring