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Check out these pictures of underwater drones - the future of submarine warfare

Jeremy WilsonMar 8, 2016, 17:19 IST

Canadian Navy

Navies around the world are racing to develop unmanned undersea vehicles - drone submarines. It makes sense because it's a lot of risk and costs a lot of money to keep humans alive under the sea.

Already these unmanned craft are carrying out intelligence and mine countermeasure work, but there's no reason why they can't replace manned submarines altogether as the technology develops.

Here are some of the drone subs that are already in operation.