Submerged submarine endurance should be based off of battery life instead of air time. In addition, battery life should be based off of submerged speed. The faster a sub goes while submerged, the faster the battery drains.
This could mean that a sub could traverse the entire map submerged, but would need ten minutes or more to do it. On the other hand, a sub could go 20 knots underwater but would only stay under for two minutes.
(I posted this in the Submarine Suggestions but I'm sure it will get lost in there.)
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