In the center of the room, there is a large glass aquarium. There seems to be a dim light coming from it, enough to dimly light the entire room, though you cannot tell what is creating the light. Anyone who looks up notices that all of the floors open up to this room, with water feeding into the aquarium from floors above it.

Blake, Dave, Collin:
You easily make your way to the staircase. Aside from the above-mentioned glowing aquarium, there seems to be nothing of interest on this floor.

Try as you might, you can't seem to find the elevator. It may have been buried in debris, or maybe you're just not looking hard enough.