how do i get to the serpent idol? am i even in the right room? the room im in has a lock that the serpent key fits and the floor has a bunch of small holes and one big hole under what looks like its supposed to be a mirror. when i swim under i have a choice.one takes me to a room that looks exactly the same and the other is a small round that goes out of the water but i cant get out of the water. am i in the right place and if so how do i get out of the water???