Heraing I was interested in history and did espionage research, a fellow I've met recently told me an interesting story.
The Bismark was the most advanced engineering project of its time. The hull construction techniques were way superior to anything any other nation has built to date.
Toward the end of WWII, to prevent the Bismark secrets from falling into Allied hands, the engineering drawings were spirited out of Germany to South America.
This fellow said he will show me the drawings sometime in the near future.
True or not, I don't know, but it makes an interesting story.