Gaster's hive of scientific research is piled high with dust and disuse, the instruments and machines abandoned and forgotten to time and knowledge. The power within the True Lab is still functional, cameras and screens powering on when passed by with physical presence; within one of the larger rooms, the last vestiges of hope remains, the plans, schematics, and machinations of the barrier draining machine Sans and Alphys were developing before the Glitch locked behind a trapped, impenetrable door.
The Amalgams return to the halls of their former prison on occasion, remembering their suffering and loss, but don't often venture below the main Lab. There is no prey below, and the memories hurt. Only Watchingman remains within, awaiting the return of his long lost friends.