Full penentration, Yes. Sticking you'r head into the hull/bridge, No.
And ice-diving with a reel...Not an option for a person without the proper training and knowledge of linehandling and methods for refinding a lost reel. A thick rope around the waist is the way.
Cutting corners kills.
Best reagards.
ok, I know some agencies teach it this way, but I have to ask- would you tie a line to yourself and your buddy on any other type of dive? And to the poster about having done the wrecks off NC and they are not technical penetrations- U-352, Papoose/Hutton/ lets rename it again wreck, etc. I would say most of us would agree that they are true penetrations.