Costa Rica shipwrecks, long thought to be pirate ships, were transporting enslaved people, scientists say

Marine archaeologists have discovered that two shipwrecks in Costa Rica that were previously believed to be pirate ships are 18th-Century Danish slave ships that have been missing for centuries.

​ Marine archaeologists have discovered that two shipwrecks in Costa Rica that were previously believed to be pirate ships are 18th-Century Danish slave ships that have been missing for centuries. Read More Breaking News, Latest News and Videos | CNN