Finding no secret passages or traps, the groups backtracks into the first chamber, the room is still quite large, and from your new orientation there is a door across from you, one on the right wall, and the left wall features the roaring gap in the wall past which you can see lightning dance among dark roiling storm clouds and rain whistling past at a sharp angle due to powerful winds.

Neither door appears to have any special markings or features, both being the same size and cut from the same sturdy wood.