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Equip submarines with external sails sans masts. Control the sails via cables attached to the sails at various points.
Ride the currents just like a schooner rides the tradewinds, tacking to move "upcurrent" or just up and down.
[link]
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I suspect the ocean currents are not generally fast enough for your porpoises. |
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You mean porpoises, surely [DC]. |
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Porpoises don't ride in submarines. |
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you can only get propulsion
from these currents if you are
in a spot of water that mover
the other way (just like
sailing) ocean currents reach
a few miles per hour max, so
you wil not be able to go very
fast. |
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