The Main Engine is a part of the S.S. Dolphin. It is also the only part found on the first day in Pikmin, so that Captain Olimar is able to lift off from the Impact Site to escape the planet's nocturnal beasts. He is able to transport this part with the help of the Pikmin he discovers upon landing on the planet. When the Main Engine is restored to the S.S. Dolphin, the ship will flip over, and the part will be added to the bottom of the ship, allowing Olimar to continue on to The Forest of Hope to find the rest of his lost ship parts. In Pikmin 2, the Dream Den cave is found in the same location as the Main Engine.