Twenty feet north of the third metal wall, the corridor enters a vast cavern, opening out onto a ledge. The corridor continues out onto the ledge, but there the walls no longer are made of stone. Instead, they seem to be made of some invisible substance, transparent as glass when faced straight on, yet silvery when seen from an angle. The corridor shape is no longer square, but is domed, as though a series of invisible hoops were supporting it. The corridor is very warm.
The corridor occupies the central part of the ledge, which apparently projects from high above the floor in a very tall cavern. Silvery gloves rise from the floor of the cavern, apparently far below, float slowly past the ledge, and disappear into the flat, silvery ceiling about 50 feet overhead. Those of you who've seen an aquarium recognize those globes as bubbles. The invisible substance is holding back water that fills the cavern from flooding into the corridor. Forty feet ahead of you the corridor widens, and you can make out the silhouette of a large hulking shape sitting in the middle of a round platform at the corridor's end.
Taris detects no evil.
OOC:
Hopefully that description was clear!