The Soviets got one to work darn well in the late 1970s. The VA-111 Shkval using a solid-fuel rocket engine and supercavitation. But again, a MAJOR jump in both the technology and materials available between the ACW and the Atomic Age Cold War of the 1970s. = I seriously doubt Hunt's version could have been made to work anything like he had hoped, if at all, with what he had to work with. = Another Vintage Age Dream Weapon right up there with Fulton's Underwater Cannon. (at least that survived actual testing) = An interesting and innovative FUN addition to a purely Vintage SCI-FI/Weird War story along with Nemo's Nautilus, Tesla's Death Ray, Griffin's Spaceships, etc, etc . . . but, IMO, just not actually feasibly achievable for the times.
And, like I said, I would be greatly interested in seeing the results of someone, anyone, who could make this work using only the materials and tech available to Hunt himself.?
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Keep It FUN!
Dan G
Dan G