On Monday Texas news outlets reported underwater explorers had located a Nazi submarine sunk off the coast of Texas. What was a Nazi submarine doing off the coast of Texas? Exactly what you fear.

Apparently the Germans sent 22 submarines, or "U-boats" to the Gulf of Mexico in 1942 after the U.S. declared war. They sunk nearly 60 American vessels -- one right in the mouth of the Mississippi River.

The Coast Guard only sunk one submarine: U-166. It's been sitting on the ocean floor ever since.

Why weren't you taught in school about the German submarines hunting shipping vessels in the Gulf of Mexico? Because the government did everything it could to keep it a secret. First, to avoid panic and hysteria. Second, because the Coast Guard was being embarrassed by them and the war department wanted to project an image of competence and superiority.