The Sink The Sink is a in the Big MT in the " " " Old World Blues " . Located at the top of the Big MT dome , it provides , as well as a place to purchase items . Background . Originally owned by Mobius , the Sink served as a test bed for several personality subroutines . Mobius removed the personality chips , disabling many of the various functions of its modules . After a heated argument with Mobius , Klein took the chips and tossed them off the Sink ' s balcony . Various staff members working in Big Mountain later recovered the chips and stored them in different areas of the facility . As the Courier progresses , they can find the backup holotapes , making the modules fully functional . Layout . The Sink consists of five rooms connected to a central hub containing the Sink Central Intelligence Unit , Book Chute and the Sink Auto - Doc . It contains a workbench and a reloading bench with a crate beside it , and lockers above each of them . The main entrance foyer contains both a Nuka - Cola vending machine and a Sunset Sarsaparilla vending machine along with exits to the Think Tank and Big MT . A small agricultural room contains a refrigerator , electric hot plate , the biological research station , and space for growing plants . A large living room consists of a couch and table overlooking a large screen displaying a loop of the " Old World Blues " opening slideshow . Toaster sits on a table in the corner alongside Light Switch 01 which is mounted on the wall . The bedroom is equipped with a queen sized bed , a set of lockers , a chest , a footlocker , a safe , and several shelves . Additionally , Muggy ' s original spawn location is in the corner and Light Switch 02 is located here to the left of the door leading to the living room . Behind a door , initially locked at the beginning of " Old World Blues " , sits a set of tanks that hold the Courier ' s brain , spine , and heart if they are currently removed . Upgrades . The Sink can be upgraded by finding back - up personality holotapes scattered around the Big MT . Many appliances are available for reactivation and upgrading , including : Sink Auto - Doc . The Auto - Doc in the Sink is a far superior model to other Auto - Docs , because of its multiple functions . It is the only object that offers cosmetic surgery , as well as several , although pricey , implants after finding them in the Big MT . The Auto - Doc can also heal the Courier fully , including removing all radiation and addiction s . It can also restyle hair , being the only other NPC that can apart from Sergio . Biological research station . The biological research station is the mojo mac - daddy of all things agricultural . It has the ability to clone any dried plants found in seed bags in the Big Empty , and also can process other plant matter into Salient Green , the green goo that can create most plants when accessed at a campfire or hotplate . Blind Diode Jefferson . The musicless jukebox in the Sink is the upgrade hub of all things pertaining to the sonic emitter . After finding holotapes with certain frequencies in the Big Empty , Jefferson can tune any sonic emitter to that frequency , giving the pistol different and unique properties . Book Chute . The Book Chute is a Communist - hating destroyer of knowledge . It plans to destroy all things that resemble knowledge , and all things which might aid in independent thought , such as pencils . After its upgrades , it can break down any , clean or destroyed , into blank books . It can also break into and scrap metal , as well as into and scrap metal . Light Switch 01 . Light Switch 01 is found in the room next to the Toaster , and has a more laid back personality than Light Switch 02 . Its second upgrade provides the option for lighting that raises Intelligence , Science and Repair skills for twelve hours after exposure . Light Switch 02 . Light Switch 02 is located in the Bedroom area and possesses an expressed hatred towards Light Switch 01 for its professed superiority of larger processors . Its upgrade provides the option for lighting that raises Charisma , Barter , and Speech for twelve hours after exposure . Muggy . A miniature Securitron that has an addiction to all things relating to dishware , cups , and especially mug s . Its second upgrade allows it to create a small supply of , scrap electronics and other things once every day . Sink . The actual , water basin - associated sink in the Sink is a germiphobe that acts as a source of clean water , and after being upgraded , can fill up any empty bottle ( empty Nuka - Cola bottle , milk bottle , etc . ) with water turning it into . Sink Central Intelligence Unit . The Central Intelligence Unit acts as the hub for all the appliances in the Sink . It can turn on or off the personalities in the area , leaving them to function in a quieter state . It also acts as the snobbish merchant and repairer of goods and sells certain mods for weapons after their holotapes are found . It does restock items like other merchants , although only after three days inside the Big MT . Toaster . An evil toaster with aspirations of a second Armageddon which can make plain Saturnite fist s into the super - heated . It can also rip apart other small appliances such as cameras , iron s , hot plate s , and even other , into their basic components , acting as a source of energy cells and scrap materials for the work bench or reloading bench . Appearances . The Sink appears only in the " " " Old World Blues " .