Good deal, thanks.
BTW two books to read on the topic, if you haven’t.
Iron Coffins, by a surviving U-boat captain on the German U-boat war.
And Silent Victory, on the U.S. effort, primarily in the Pacific.
Most people have =zero= understanding how effective our fleet submarines were at wiping out Japanese cargo shipping. By the end of the war, between those and our air superiority, it was largely down to barges and little wooden auxiliaries. If the A-bombs hadn’t led to unconditional surrender, Japan in 1946 would have been starving to death by the millions.