Dean
Don't bother lifting it as one unit, too much work and I know you don't like that!
. Blow the sh** out of it with C4 and then pick up the pieces at leisure later. You can then do what you are planning to do and get it to the scrappers in ready cut up pieces and get the beer money
for the boys. A bonus is likely to be a few salmon floating to the surface due to concussion and not one knot to tie as your grannie knots are individual works of art and would use up your dive time!
You can use that clandestine military training of yours to good effect by declaring a new distinctive speciality- Deep wreck destroyer and CCR salmon poacher as well as good old underwater search techniques to find the bits to weigh in!
Don't forget to debrief around the Statoil hot chocolate machine!
D.