Get some fighting room and kill them both. The crane console has no power. A box near the door holds two grenades. Head back into the hallway. Continue through the hall, but consult your map when you arrive in the area with the most Puffers.
Vegetation conceals a door there.
One T-7 later, the door is clear. Unlock the door with your C ID Card and enter the passage beyond. Follow the catwalk and descend the ladder. On the ground, watch for the Orchid around the corner to the left. Thanks to a game bug, it can attack you through the wall, but you can't reciprocate.