By Abigail O’Leary A terrifying deep-water expedition has been planned to explore a 300-year-old shipwreck thought to hold treasure. Colombia’s government on Friday announced plans for a deep-water expedition to explore the mythical galleon San Jose, sunk in the 18th century in the country’s northern Caribbean and believed to contain cargo valued at billions of dollars. It is the first phase of a scientific research into deep waters that aims at collecting information to determine which pieces are suitable and possible to extract. The wreckage is 600 meters deep in the sea. Colombia located th…