How this works OOG is that after going through the first room, the party will find a winding staircase. For every three turns down the stairs, a panel will open to one of the other rooms. The players must realize that they have only one hour and 45 minutes from the time they start until the tower is so submerged there is no way out. This time limit is independent of holds. This room has walls of smooth obsidian.
Several shelves line the walls.
An closed doorway leads to an adjoining alcove. The room glows green. This is the top room of the submerged tower. It was used by Accolon as a storage area for his most valued items and ritual components. The various items that withstood the passing of over a century still line the shelves.