NASA is considering the possibility of placing astronaut settlements on the moon in moon caves
One of the holes in the smooth surface of the Sea of Tranquility. The "bottom", as we see, is also smooth, covered with boulders.
On the surface of the moon, there are millions of large small craters caused by billions of years of bombardment of the surface of the Earth’s satellite by meteorites. But there are more interesting formations on the Moon - these are openings, dips, which now totaled about 200.
According to experts, some of the holes can serve as an entrance to an extensive network of lunar caves (which, in turn, were formed under the influence of lava flows and geological activity The moon hundreds of millions of years ago).
The sizes of the "holes" are different. Now found holes with a diameter of 5 meters to almost 900 meters. The first three failures were discovered in the images transmitted to Earth by the Japanese Kaguya apparatus. All others were found as a result of applying the new image search algorithm. The algorithm is used to process images from the LRO apparatus (Lunar Reconnaissance Orbiter).
Most likely, the “roof” above the voids in the Moon’s crust collapses under the influence of all the same meteorites that create shock seismic waves when they fall. The surface does not withstand and collapses. The study of voids can reveal the history of the origin of the lunar seas, where the vast majority of the failures were discovered.
Currently, the LRO camera has covered no more than 40% of the moon’s surface, so new discoveries are yet to come, it’s very likely that there are more voids on the moon than it has been discovered to date (according to scientists, these formations may be 2-3 times larger, what was found now). Some of them probably cannot be detected now, because some regions are always in the shade, and the algorithm simply cannot work with such dark areas.
According to scientists, subsurface voids on the moon can be an ideal place to place astronaut settlements, scientific stations and other infrastructure facilities. It is enough to seal the entrance, and the rest of the space can be mastered. If the assumption of the existence of a whole network of subsurface lunar caves is confirmed, then the settlements can expand without any problems - there is no need to "bite" into the lunar crust, nature did everything for man.
Void is an ideal place to settle. Neither solar radiation, nor micrometeorites, probably a reduced amount of dust and there are no excessive diurnal (meaning lunar days) temperature fluctuations.