When this video first surfaced a year ago, there was some discussion of this shark actually being a "Short Fin a Mako", as opposed to a GWS.
I have no idea really.
It looks like a BFS to me.
By the way,......
I was told about 3 years ago by a VERY experienced "Tech" instructor to stay clear of penetrations to the Duane.
His reasoning was that the old tin can, is beginning to break up.
I then mentioned in passing to a then very senior NCO "Coastie" friend of what the instructor said about entering the ship, and he said that above the main deck was probably OK.
either way, I personally would not think of diving that wreck at that depth with anything less than a 100cf tank.
And really, I own several 130's and larger tanks, and would use a 130cf or greater on it.
Chug
Thinks it's better to be looking at it, as opposed to lookin' for it, when it comes to Nitrox.