With nearly three-quarters of the planet covered in water, what lies beneath the surface hides more than undiscovered marine species — it also holds treasures lost at sea.
Sea crossings were recorded as early as 60,000 to 70,000 years ago. As people explored and met other cultures, trading began, using ships to transport goods not found in their own lands. Ships were also used to move cargo, including precious minerals mined from the Earth.
Yet, all of marine history has not been smooth sailing. What happened to ships that never arrived with their precious cargos now inspires the dreams of treasure hunters. Although there are many known — and unknown — treasures still lost, we examine some of the greatest underwater treasures ever found.