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Those are known as Jet Boots. They work fantastically. Range is around 2km subsurface at moderate speeds. The very nice thing about them is it allows one diver to carry another in tow or double their load weight. Their weight isn’t bad and is rather insignificant compared to the weight of twin 100s. Further, the weight in the battery pack can be used to replace dive weights/weight belts used for buoyancy compensation.