Derek Lyons wrote:

ISTR there being a number of vents topside on the missile decks...
But keep in mind two things; A) the Soviets did use doors on limber
holes sometimes, and B) modern [nuclear] submarines don't crash dive
or crash surface. You don't need the big honkin' limber holes
characteristic of the diesel boats.

Want to see one crash dive with air flying out over the missile deck?:
http://www.youtube.com/watch?v=bfMxcNvJKEo
Apparently they crank up the stern, flood the forward ballast tanks and
use the bow planes and its screws to force it underwater, using its wide
hull to shove it under even though it still was positive buoyancy.

Pat