[SpirituTuo]

I could be wrong, but I don’t that is the screw, rather I think those act as dive planes and rudders.

[22202NOVA]

That’s my thought too. I didn’t see any conventional dive planes, and the screw looks like it’s covered.

Then again, I was in the Army, so I don’t know much about submarines beyond Tom Clancy.

[Dr. Bogus Pachysandra]

“I think those act as dive planes and rudders.”

I think you’re probably right. Looks like the screw is covered by a tarp.

[A Navy Vet]

"I could be wrong, but I don’t that is the screw, rather I think those act as dive planes and rudders."

Same here. You can see a covering where the screw would go.

[DoughtyOne]

You could be right. I wrote some comments to HosePipe that touched on this. You may want to check it out.

http://www.freerepublic.com/focus/news/3275989/posts?page=51#51

[Afterguard]

You are correct The prop is shrouded.