Surrender your booty!   There be archaeologists on them thar seas!

Just off the coast of North Carolina the Queen Anne's Revenge, Blackbeard's flagship, is believed to have sank in 1718.

But the archaeologists diving to the wreck there aren't trying to find gold doubloons or something cool, they instead want to save the cannons ship's from saltwater corrosion.

Yes, after nearly 300 years they are worried the cannons will be gone if they don't brave the storms right now.    To save them, they will apply skinny aluminum rods to the boat that act as annodes, supplying an electrical charge that inhibits corrosion.