As Lujan's marines guessed, the following is a shelter built before the war.
From entering the tunnel, you can smell the thick bloody smell. All kinds of signs show that this place has become a place of worship for these mutants many years ago, and the walls are covered with various chilling patterns with blood and grease.
However, Lu Yang and his team-mates did not expect that they found a broken hibernation chamber and a clone breeding device still working in this shelter, except for some human skeletons!
This clone breeding device contains