At first glance, it seems a bit absurd that Bond suddenly knows his way around a nuclear submarine in the final scene of The World Is Not Enough. But then you remember that it’s Commander Bond, thank you very much.  Of course he’d feel right at home among torpedoes and control panels!  Still, how else would he know to “get out of the submarine and back in through the reactor room escape hatch” like it’s just another Tuesday?  Thankfully he’s a good swimmer!