...I ran across this article today and immediately thought of your book Waski. I'm not sure if you're finished with the book or if this article will be of any help but after reading it I thought it was an interesting topic.
http://www.foxnews.com/world/2016/02/09/dangerous-business-ship-salvage.html?intcmp=hplnws
http://www.foxnews.com/world/2016/02/09/dangerous-business-ship-salvage.html?intcmp=hplnws