Chemical Lake

Chemical Lake is the second area on Duron in Pikmin: Ultimate Doom. It is a large rolling jungle plateau of dirt and rock with a lake at its foot. It is so rugged, Olimar has to reach it by foot to make a landing zone. The lake isn't actually full of chemicals, rather, the area is full of acid and chemicals. Green Pikmin are found here via Leafy Candypop Buds above ground. In this game, Green Pikmin don't have an Onion, rather they are stored in the Trailblazer.

Initial visit
Louie stumbles onto an ancient tablet relating to rips in reality, and the trail leads underground. So Louie and his Pikmin venture to Acid Cave while Olimar and Pikmin collect 20 water packets. When both tasks are fulfilled, Louie returns with the Relic Amulet. It has a location engraved on it: a desert with more ancient tablets: Deathbone Desert.

Caves

 * 1) Acid Cave