Expedition to 300-year-old shipwreck that could hold Spanish treasure of gold and emeralds worth $20 billion

• Colombia sending a deep-water expedition to explore the 300-year-old San José shipwreck.
• The Spanish galleon, discovered in 2015, is believed to hold treasures worth up to $20 billion.
• The expedition, using advanced undersea technology, is set to begin in spring.

A 300-year-old shipwreck in the Caribbean is believed to hold gold and silver coins, emeralds, and other sunken treasures that could be worth $20 billion.