How to unlock: Enter the Longneck Lukowski's Cannery (M3,2) and talk to Theodore Collins.
Theodore Collins whom you will meet right after entering the Longneck Lukowski's Cannery will order you to find the reason of the meat being tainted, suggesting that Mole Rats caused the trouble. You will learn that the truth is different... If you agree to help him, you will receive 50 bottlecaps in advance.
Go to the production room and then upstairs. In the corner there is a large elevator that will lead you to the basement - now there is no return. You will fight mostly ghouls of various types and in great numbers. One of them will be unique - he will glow in light blue color. Watch out especially for him and leave some special weapon or grenade just for him. Be prepared for large numbers of melee fights. First turn right and go to the water tank. Then, use the pipe to get to another similar tank and then walk upstairs. At the end of the road you will find a fusion core.
Go to the neighboring room and keep using the stairs to reach the top, the room with valves. Under no circumstances should you jump down (it's the place from which you came here). Use the last stairs. After opening the door you will be attacked by the questgiver (his robots will not harm you). He closed himself in his office above the production hall.
The enemy can be killed with 3 shots and he has nothing interesting. However, at the end of his room you can find Tales of Junktown Jerky Vendor (permanently provides better prices at merchants) and, just above it, the Barter Bobblehead (permanently provides 5% better prices at merchants) lying near the computer. Behind the gate closed by the terminal there is also a basic assault shotgun.
Quest rewards: experience, 50 bottlecaps (received at the beginning).