Perhaps there is an ROV vessel in the area already due to the oil and gas ops which can salvage it? Not cheap of course but it depends if it has to be salvaged for any reason....
There is! It is the Northern Canyon, on contract to Centrica. Operator Hallin Marine (
www.hallinmarine.com ). Vessel has both ROVs and diving spread onboard. Operating in Morecombe Bay area now until approx beginning of February 2010.
Operating cost per day of the Northern Canyon > Hull value of of a PA30 so unlikely to be worthwhile. I need to declare personal interest - but happy to help if someone wants it back