Third Base was located within a mountain. The entrances and exits for traffic tools like spacecrafts were utterly invisible from a distance, as optical camouflage technology combined with holographic projection technology enabled the Federation's bases on alien planets to hide beneath standard imperial detection.
From afar, the three rushing Mechas seemed to crash directly into the mountain wall, but the next second they all disappeared without a trace. The ground beneath their feet had turned into a metallic creation, similar to the deck of an aircraft carrier. It was a large area reminiscent of a parking apron, and its design was almost an exact replica of Sixth Base.