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Modern DE submarines, unlike their WWII counterparts, can stay down for weeks before the need to snorkel and recharge their batteries. Battery technology, air regeneration equipment, and other technological improvements over the years have significantly increased their submergence period capability.
Of course like any DE boat, their submergence time is also directly related to the tactical situation; if they're running at high speeds on the battery for extended periods, the time between recharges is significantly reduced.
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