The baths out in the open are all empty, except the one occupied by a man with a "tt" shaped tattoo on his arm.
The bath in the dark room (A sales gimmick to show off the spas and how they look in the dark) has stuff around it:
There is a long electric cable.
A set of power sockets
A couple of solar powered lights, glowing with yesterdays sunlight.
While you are looking, a little robotic trolley rolls on into the store and stops midfloor.
He looks at the crystal, and says, "hmmm that looks like one of them alien crystals. It would make a good buy in at the poker game. Head down the train tunnel in the train station. The password is "'Never fold 2 and 7' "