Scotty comments the airlock on the Vengeance is four meters.
No, Scotty says the airlock is about four SQUARE METRES in area.
And he's probably wrong. Apart from being visibly larger than that anyway (as you can see when the security guy gets blown out of it) a 7 foot hatch is small enough that Khan and Kirk would have to be practically holding hands to fit through it. Although they are side by side, they are not QUITE close enough to touch each other; one or both of them should be dead.
FWIW, the novelization renders the line as "four meters" and not "four square meters." So Scotty's probably just exaggerating to make a point (he tends to do that, you know).