Waterfall Cavern is a room in Tallon Overworld in Metroid Prime. It is a small cave, open to the sky and inhabited by a number of Blastcaps on many mossy rocks. It consists mainly of a shallow pond and a few small waterfalls in one corner. A large piece of rock divides the room partway, so that Samus can only pass through via Morph Ball; on the other side is a smaller, closed cavern with the door to Frigate Crash Site. A Secret World can be found in this room: [1]