This is a great early book that interveaves historic times with specific wrecks. Its a good idea and works well. It covers all sorts of wrecks from the Mary Rose to the Association. I’m in in on page 103 when I helped to find more cannons from the Penlee cannon site, originally discoverd By Al Down and George Sanford.That was in 1968 so it wont come as any surprise that this book is out of print. Even so I have seen it in second hand bookshops. Well worth a read and great value as research material.