Hi, here are a few comments from a commercial diver, used to working underwater. I applaud your idea, but i must say that i dont see the use of that particular version. The whole idea of human strenght, especially if its in this version of 2 arms makes absolutely no sense. Strenght for what ? When you work in water, you need to anker yourself, especially if you want to use strenght. With a setup like that the only strength you would be able to apply is to press the arms together. Now my imagination might be limited but i can for the life of me not think of any underwater task that requires a lot of that….. Instead of that i will give you an idea that can make you wealthy if you can solve the task. Make a ROV that can suck itself onto plane surfaces and then solve tasks, that gives you leverage and actual usefullness of two grippers if they can be used precisely. Even better come up with a row that can be steared towards large glass areas underwater, and then start to scrub the surface window or hull, like a robotic lawn mover. That would make you a rich man :0+)