Underwater archaeology

The offerings appear to have been made from an island that once existed at the center of the lake.

The shipwreck was discovered by an international team of scientists and engineers in collaboration with the Colombian Navy.

The search was funded by Microsoft co-founder Paul Allen.

"Seeing a 7,000-year-old site that is so well preserved in the Gulf of Mexico is awe inspiring."

The treasures are at risk of ruin, the researchers warn.

One coin in particular could be worth up to $100,000.

The Dutch ship was carrying contraband when it sank.

Since the 1920s, pottery spanning thousands of years has turned up in Lake Biwaka. Archaeologist don't know why.

You'd think people would have noticed earlier.