The hexagonal fortress, quietly located in the middle of the small crater, was like a medal embedded into the surface. The sturdy Moon soil was its first wall, and a tunnel was carved on one side of the crater; it was the only entrance to the entire military base.
The entire military base located in the crater covered a total area of 9,000 square meters with three floors above and below. Each floor was five-meters high, with the highest point parallel to the outer edge of the crater and the lowest point 20 meters underground. The roof was made of concrete and covered with soil about 2-3 meters thick.
The wall was divided into two parts. The outer wall was 1.5 meters thick, the inner wall was 2 meters thick, and 0.7 meters of soil was sandwiched between the inner and outer walls to protect against cosmic rays, solar wind, and meteorite impact.
Due to the insufficient width of the tunnel, the huge lunar rover was parked outside the military base.
