Real or Not Real

You look at the carvings, but can't discern anything. They're very pretty and very complex, but they don't seem to mean anything, at least not to you.

Under the whirlpool, a waterfall floats you into an underground lake. As you pull yourself from the frigid pool, an icy palace opens before your eyes. Thick layers of ice coat the cave's interior and ornate carvings decorate the walls. Your guide stands on the shore, shaking out her fur. She inspects the surroundings, and you do the same. You realize there is no discernible exit, though some of the ice looks thin and even cracked in some spots along the walls.

What do you do?