Safehouse (Underground) Question

[MANEATER]

Is there anything else to the Safehouse besides collecting the one Sanctum Key? The Pump Room isn't exactly my strong suit so I'd like to make sure I'm not missing anything else vital before I adjust the water levels again...

[DrBoop!]

there's some important information there for later puzzles if you didn't write anything down or screenshot, but you can always look up that information

(also i'm not done the game so i only have partial knowledge, i may be wrong)