I know next to nothing about submarine dynamics, but I am an RC plane pilot, and it looks to me like this fish swims in a constant stall. If it was a plane, I'd

I know next to nothing about submarine dynamics, but I am an RC plane pilot, and it looks to me like this fish swims in a constant stall. If it was a plane, I'd be inclined to say that its center of gravity was too far back. The video states that it can control its own bouyancy, yet it looks like it's constantly fighting to swim level instead of sinking. If it could achieve a neutral bouyancy then I bet it would glide along much more like a real fish.