The Murgol Lair (also called Lair of Murgol) is one of the starting dungeons for the Yeek. It is inhabited by various underwater creatures as well as hostile Yeeks. The entire dungeon is underwater, but there are plenty of air bubbles that can be used to recharge one's breath. The dungeon is also littered with traps, so any means to detect and disarm traps can be very helpful.
There is an alternate layout of the map that is populated with nagas instead.