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The Sink is a periphery that rests on top of the central dome of Big MT's Think Tank. It serves as the Courier's main base of operations while in the Big Empty, and features several amenities to cater to their needs. The Sink was originally owned by Doctor Mobius, but was abandoned when he fled to the Forbidden Zone after a falling out with Doctor Klein. He left behind several disabled artificial personality routines after flinging the requisite chips over the balcony edge, leaving them to scatter all over the crater. However, should the Courier find these personality chips, they can be reinstalled to restore the Sink's lively atmosphere, and the personalities will bicker and flicker like in past times.