Level 4 can be reached by marines using two access ways. The vehicle doors have been
shut down and sealed due to xenomorph alert. To gain access to level 4 with an exosuit, the marines must
unlock the door from the other side.
Marines may reach level 4 alternatively through an access tunnel by removing the pipe, that blocks a door.
Shoot at the pipe to remove it. Duck under the door to proceed.
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