The Velvet Curtain The Velvet Curtain is a " Fallout 3 " quest added to the game with the " Point Lookout " add - on . The quest leads the Lone Wanderer to find the whereabouts of missing Chinese agent Wan Yang , and use the Submarine self - destruct codes in her possession to blow up the stranded Chinese submarine SSN - 37 - 1A . Detailed walkthrough . There are several ways to start this quest : Obtain the orders from the locked locker . Once at the locker ( located on the right side of the boardwalk coming from the ferry ) , open it and take the holotape Box 1207 - Spy ' s audio password . If the terminal in the motel room or the one in the Detention Camp was not read , this will activate the quest . The holotape instructs the Lone Wanderer to go to the bank and use the password on the tape . It also informs them that the safety deposit boxes can only be accessed by the owners ' voices . Access safety deposit box 1207 . At the People ' s Bank of Point Lookout , go to the safety deposit box room and stand in front of the speaker . Activate the holotape received from the locker . The speaker will say " Processing . . . processing . . . Safety deposit access granted " upon which box 1207 will open . Pick up the holotape Espionage debriefing . This tape informs you of Agent Jiang ' s mission to destroy a captured Chinese submarine and his search for another agent , Agent Yang . Find Agent Yang . Agent Yang has the codes to destroy the sub within a false molar . The molar , unsurprisingly , is in her head . Exit the bank , turn right and a few steps eastward will have the Lone Wanderer at the Naval Recruiting Center , which is just beyond the walled bumper car arena . Go through the door behind the counter on the left and activate the DiA Officer ' s terminal . Access the file " Field Report - Yang Capture / Transfer " . Read it to learn the fate of Yang being captured by U . S . officials and detained at Turtledove Detention Camp . Before leaving the room , don ' t miss the mini nuke on the table next to the computer and the moonshine on the floor next to the safe . Turtledove is directly north from the Recruitment Center . The camp is devoid of swampfolk , but swarming with defense robots and ghouls . Enter the morgue through the cellar door , open Yang ' s remains locker and take the submarine self - destruct codes . Escape the morgue the way it was entered ( through the cellar door ) , or use the hatch located near the cremation chamber , which leads to the septic tunnel . In the tunnel , exit to the east of the Turtledove Detention Camp , in the swamps . Also , the septic tunnel might be a good way to enter the morgue without fighting a large number of ghouls and sentry bots - investigate the area to the southwest of Turtledove Detention Camp , two or three squares away , while periodically checking the Pip - Boy ' s local map ( as the entrance is not displayed at the world map ) near the trash heap . At the entrance to the septic tunnel are 2 first aid boxes , 2 ammunition boxes with some shotgun shells , and a yellow maintenance barrier . Blow up the Chinese submarine . The Chinese spy sub is beached underwater , located south of the Calvert Mansion and near a pair of sunken vessels just west of the lighthouse . Enter the sub through a hatch on the conning tower . Use the terminal in the bow to activate the self - destruct , and flip the failsafe switch in the stern . Before flipping the switch , use Lockpick on a footlocker , which contains several valuable items , including a power fist . The Lone Wanderer will have about 10 seconds to escape after leaving the sub , but until they do leave , nothing will happen . Not too far from the sub site is a ship far enough away from the blast radius that it can be used as a position to observe the explosion in safety , although it may still be somewhat difficult to see the underwater explosion due to the murky water . Return to the motel . Head back to the motel , and receive some new orders from the safehouse terminal . The next objective is to meet the head Chinese agent at his bunker , located beside Calvert Mansion , underneath the atrium . The terminal directs the Lone Wanderer to a pair of cryptochromatic spectacles hidden within the toilet tank in the motel . Head to the bunker . Travel to the Calvert Mansion and enter the remnants of an aviary to the west . Equip the cryptographic spectacles now . The number of rings on each vase represents its number . Using the cryptochromatic sequence activate the vases . The sequence is : 1 , 3 , 2 , 3 , 4 , 4 , 2 . A hatch will appear on the floor next to the # 2 vase . If entered correctly an audible " 5 - ping " noise instead of the normal " click " can be heard . If the hatch does not open , enter the code a second time immediately after , ignoring the ' wrong ' sound effect , after entering the code a second time , the Chinese Intelligence bunker should open . Escape the Chinese bunker . Inside the bunker is a large number of weapons and ammunition and a workbench . The Lone Wanderer will be approached by a protectron who asks them to leave the hazardous area . Choose to give the robot the pass phrase or tell the " tin man " to get out of the way . There are no benefits or drawbacks to either option save personal preference on where the robot should stand once the quest is complete ( assuming it isn ' t destroyed ) . Regardless of the decision , don ' t go right away . There are numerous crates with various types of ammunition , and a Stealth Boy next to the door that was used to come in . There is also a Stealth Boy and mini nuke on the shelf next to the doorway the protectron either leads the player character through ( pass phrase given ) , or it guards ( tin man option given ) . Enter the room , and pick up the Backwater rifle on the shelf next to the door , then activate the terminal . The terminal tells the Lone Wanderer the funds for completing the mission have been wired to their next of kin and advises them to take their death honorably . The terminal will then seal the chamber , and fill it with radiation . There are two methods of escape , and one option to buy some time . Entering the run - off tunnel or escaping through the door will complete the quest .