5 ›Flooded Rooms
FloodedBigHallDestroyed
Straight underwater room. Lockers at start and end. You can swim into the abyss to be out of range of Anglers but be careful that you don't die to parasites or your PDG. For PSS, go to the left and get behind rocks at 5th screenshot.
PSSSS
4 ›Flooded Rooms
FloodedStraightRightWindow2
Generic straight underwater room. No spots, god forbid you get this in lockerless.
4 ›Hadal Blacksite
RightStraightZigZagW/Rooms
A zigzag type room with siderooms straight ahead and another to the right. These can be hidden in for PSS/SS.
PSSSS