Airlock is an early Atari game developed and published by the now-defunct Data Age. If you guys remember the segments in Sonic the Hedgehog where you're about to drown, Airlock is a game based entirely around this concept. The game has you escaping from a damaged submarine as it steadily fills with water. You start out the game with 10 seconds to escape the first level of the submarine, but each level gets the remaining time added onto it as you progress vertically out of the sinking ship. A good game for quick reflexes.