Those ships will never be raised - at least not until there's some huge leap forward in technology. The steel in their hulls would be seriously weakened now even if it hadn't been submerged in salt water for seventy years. In all probability, if any sort of stress were put on those hulls they'd fall apart.
There are lots of shipwrecks off the Outer Banks. The most famous probably is the U.S.S. Monitor. Some years ago the Navy was able to raise her turret, which has been under extensive - and expensive - conservation since then. It's accepted that the hull can never be raised; it's deteriorated to the point where it's literally falling apart where it sits.
I believe there are at least a couple of other U-boats out there that would be more practical candidates for preservation - but it won't happen.
The best that can be done with these latest finds is to photograph them and document them thoroughly, and then leave them in peace.
Youth, talent, hard work, and enthusiasm are no match for old age and treachery.