The Secret of the Pearl Islands

For the past 137 years, a mysterious wreck has emerged at low tide each day on a beach off the coast of Panama. Researchers now know that it's the presumed lost "Sub Marine Explorer," one of the world's first submarines and a vessel that would ultimately kill its German inventor.

For the past 137 years, a mysterious wreck has emerged at low tide each day on a beach off the coast of Panama. Researchers now know that it's the presumed lost "Sub Marine Explorer," one of the world's first submarines and a vessel that would ultimately kill its German inventor.