The submarine self-destruct codes are a quest item in the Fallout 3 add-on Point Lookout.
The self destruct codes have been implanted on one of the teeth of Chinese spy Wan Yang. It is used in order to detonated the SSN-37-1A Chinese submarine.
It can be found by opening the cadaver compartment that houses the remains of Wan Yang in the morgue underneath the Turtledove Detention Camp.
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