Cave of Unimaginable Horror

Area
The cave is in the second place the famous torturer researcher Olimar landed, the Valley of Springs. The cave itself is right next to the landing site so Olimar can quickly lead his Pikmin to their deaths to glory.

Layout
There is only one floor and no boss. However there are millons of unexploded bomb-rocks and one live one, meaning a pikmin extinction is inevitable. However all the bombs explode instantly so every pikmin dies which makes the pikmin hating pikmin loving Olimar happy sad.