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[DavieTait]

http://news.sky.com/story/1662512/autonomous-spy-sub-can-travel-for-three-months

Hmm 3 months on a single charge of its batteries , means its going not much more than 1-2 knots and probably just drifting with the current  ( different current directions at different depths so could dive to go one way and come shallow to go the opposite way ) , certainly not NiCad's in there lol