charge into the airlock. see if I can get the like a magical scuba kit before I drown.
Walk in, try to use illusion magic to make it harder to get my exact location. Then latch onto shark guy
"Concerned statement: This one, as well, cannot swim. This one hopes that won't be a problem"
into the airlock we go
"Yeah, can't breathe underwater. Or see underwater. Or even swim in all my armor. You got anything for all that?"
I could drag you along I don't need to worry about air and it shouldn't be too far
Help the guy with swiming if he wants it
"Oh fine."
Take advantage of being a tiny little munchkin (if an uncharacteristically heavily armed one) and get towed through the water.
Out through the door is indeed an airlock, and out through the airlock is water. The instant the airlock doors open, dark water floods the chamber, pressing everyone inside back against the wall with tremendous force. Once the pressure subsides and the chamber is full, you can move outside, either swimming or walking out. At first you can see nothing; nothing but black extending out in all directions. Then lights flick on, huge searchlights that you are not standing on an elevator, but a massive machine, a drill that is descending rapidly into the water. You can't see all of it, just the outline created when it blocks off the lights. But more importantly, the search lights swivel rapidly until they converge on a single thing; a huge crab claw slowly looming out of the darkness and stretching towards you.