Its career after that was one of literal ups and downs, as it became the Allies’ most-tested U-boat.
The British put it through its paces thoroughly before it was sailed eventfully over to the States, the last U-boat to cross the Atlantic under its own power.
The Americans seemed more interested in keeping U-1105 out of Soviet hands than in analysing its refinements, and used it for repeated trials both of their depth charges and submarine resilience.
Finally in 1947 it was abandoned 28m down in the Potomac River in Maryland, was “discovered” by a diver in 1985 (though it had never truly been lost) and can still be visited.
Though its hull is buried in mud, there are plenty of interesting details to see around the conning tower and wintergarten platforms.
Hamilton, a diver and maritime archaeologist, writes clearly and engagingly, and the book is beautifully produced. Towards the back are small underwater photos of all the main features. These are related to illustrations showing their positions, so should you decide to do what could be a slightly awkward dive in this busy river you could certainly make the most of your bottom time.
There are plenty of evocative topside photos, and an appreciative foreword by sub-diving expert Innes McCartney. Like the Black Panther itself, this book ticks all the boxes.