From the Super Mario Wiki
The Bunker is Professor E. Gadd's shelter from the hostile ghosts in the Nintendo 3DS game Luigi's Mansion: Dark Moon. The bunker's exterior resembles E. Gadd's original lab in Thwomp Volcano in Mario & Luigi: Partners in Time. Equipped with several monitors and an assortment of technological equipment, the Bunker is where E. Gadd pixelates Luigi to and from the various mansions in the game, tracks and cleanses pieces of the Dark Moon, and repairs broken objects. A platform in the floor takes Luigi to E. Gadd's Vault, where captured ghosts, money, and Gemstones are stored.
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