There is a lengthy but nonetheless interesting commentry on both the sinking and raising of this boat attached to this YouTube video :
Sunken Barrow Narrowboat Finally Out (youtube.com)
The author of the commentary, Tony Dunkley, is, for several reasons, almost certainly uniquely qualified to comment. Two of the more notable grounds derive from his almost lifelong experience of boating on the Rivers Soar and Trent - firstly, and beginning in the 1950's, as an 8 year-old lad enjoying rides with his father on the BW Nottinghm - Leicester grain traffic commercials, at that time using Nottingham Pans and BW's then new Bantam Pusher Tugs, one of which, "Will Scarlet" still remains in service with BWB's appallingly incompetent and corrupt successors.
Secondly, and of greater significance, is the fact that by the early 1980's, and gained in no small part from raising a long sunken vessel in Nottingham, held by BW's Engineers, after their own multiple failed attempts, to be impossible, his professional reputation and work achievement track record as a commercial boat operator, contractor and marine engineer led to him becoming BWB's first, and for a time, only, approved and recommended contractor for the removal and/or salvaging of sunk, stranded or abandoned boats under the provisions of the then newly introduced Section 8 of the British Waterways Act of 1983.