The submarine self-destruct codes are a quest item in the Fallout 3 add-on Point Lookout.
Characteristics[]
The self destruct codes have been implanted in one of Wan Yang's teeth. The codes are needed in order to destroy the SSN-37-1A.
Location[]
It can be found by opening the cadaver compartment that houses the remains of Wan Yang in the morgue underneath the Turtledove Detention Camp.