An underwater archaeologist has identified around 250 treasure-filled shipwrecks along the coasts of mainland Portugal, the ...

In the first analysis of its kind by a former colonial power, Spain’s Ministry of Culture has identified 681 shipwrecks in the Caribbean and along the southern Atlantic coast of the United States.

Only a tiny percentage of the ocean floor has been carefully mapped, which means we know less about 71 percent of the Earth’s landscape than about the far side of the Moon. That’s a lot of ...