[jmcenanly]

I bet that a good look inside would reveal a couple of "exercise bikes" hooked up to the prop shaft for propulsion. "Hashim! Yamir! Pedal harder! The Americans are escaping! Mohammed! Load more baking soda and prepare for Crash Dive!"

During the American Civil war, the Confederates used a submarine called the Hunley against the Union Blockade. It was powered by a hand turned crankshaft

Come to think of it, there is a great deal of similarity

[PsyOp]

I was thinking of the Hunley when I mentioned the exercise bikes. I'm thinking that the Hunley would give the Iranian sub a run for its money.