The Importance of Tougher Submarines

The US had been working on this, as I said, during the into war period. They began to get some pretty decent success out of it, out of the idea. Then when they realized that actually, to be perfectly honest, their marine diesels really sucked. And there's more and hang on a minute, we have some diesel engines of about the correct power output that work really well on the railroads. That worked perfectly well. And then you have the gate O'Class, which is kind of the pinnacle of US fleet sub design coming up to the start of World War II. But what they don't change a huge amount in terms of size, layout, firepower, etc