Do submarines have keys

Certainly there is every reason to secure fire-control (of weapons , not internal combustibles) on such as secretive vessel- also firing codes, (for guided missiles) are kept in locked combination safes, for obvious reasons. for interlocks between the bulkheads these are normally unlocked but can be remotely or locally secured to prevent flooding or control battle damage (Close the emergency doors) Also there are radio communications telegraph keys and probably special pre-coded gadgets to prevent unauthorized use. of course a telegraph key or bug is different than the locksmith use of the term.