"Holes" on the moon was the entrance to the cave

3 photo. Taken from here.

1. Unusual hole on the surface of the moon, first discovered in 2009, is the entrance to an underground cave, which in the future will be able to take refuge arrived on Earth satellite astronauts.





2. The new photo taken apparatus Lunar Reconnaissance Orbiter, shows that the hole diameter of 65 meters at a depth of 36 leaves m. Due to the angle at which the camera LRO captured this education, you can see the projection, confirming the existence of horizontal voids. The projections may be the remains of the ceiling of the lava tube.



3. Old picture:



Source: