Ahh... but some day when your boat runs out of diesel, you will be glad you can submerge and make it back to port on your inexhaustible battery bank...
I ran out several hundred miles from Midway in a Gato boat one time, and was able to do that... took a while, and you do have to surface to vent the boat, but it is possible you might not have to abandon a career and face a court martial...
