There's a few problems with this. For one, your prop noise is going to be almost entirely masked directly ahead of you, because there's a whole submarine in the way. Isolating "sound of our propellers from in front of us" from "our propellers behind us" is certain to be extremely difficult if it's not completely impossible too.

I've got no idea where jcampbell pulled their information from, but I've never seen anything to even suggest it's possible to use your own prop and machinery noises like that.