Bathysphere is a development location for testing an unused 3D "camera lookaround" system. The buttons for moving around in a 3D thoughtspace appear on screen, but don't do anything. There is text on the opposing wall from you stating "this kinda sucks, maybe we should make the turning be WASD/buttons only and then have the mouse be independent otherwise scanning is gonna be weird", along with an unscannable Test Fishy entity.