(Sheppard and McKay are walking slowly across the ocean floor in water suits.)
Sheppard: You're breathing too hard.
McKay: Oh, forgive me for being aware of exactly how much pressure is being exerted on this suit right now.
Sheppard: Just think of it as a walk on the beach -- a beach that's about to explode.
McKay: That's supposed to make me feel better!?
Sheppard: No, it's supposed to make you walk faster. We're on the clock here.