Wouldn't there be safety checks in place for this? Leave hatch open (human error) water flows through first hatch which triggers a secondary hatch to close/loc

Wouldn't there be safety checks in place for this? Leave hatch open (human error) water flows through first hatch which triggers a secondary hatch to close/lock preventing water from entering far enough into the system to cause damage? I mean for 3 billion dollars you would think there would be some sort of 'airlock' system that you see in outer space movies where you have two doors/hatches to enter like a small vestibule room in a building? I've never been on a submarine so my opinions probably don't hold much weight.