[Jamie's been working on the whole swimming thing, so he's better at it than he used to be, but considering he couldn't swim at all before, that's not saying much. He doesn't know if he can make it back to base, but what if he admits as much and Arthur leaves him behind to fend for himself all night? He really will be a goner then. Ergo, Arthur gets a kind of deer-in-headlights stare for a moment before Jamie manages to snap himself out of it and respond.]

Um - I think maybe I can make it back. Y'know, once we figure out where we are in relation to the base. But maybe we should try fixing the sub first? I'm pretty good with machines, I might be able to figure it out.

[He offers this last part hopefully, because he'd really rather have the protection of a vehicle to travel through the water at night if at all possible.]