Drain the Oceans: Season 1, Episode 4

1 - 4: Sunken Treasures

For centuries treasure ships plied the oceans of the world, packed with silver, gold and precious stones. Many of them lie undiscovered on the sea floor. Using the latest underwater scanning technology and computer graphics, marine archaeologists and treasure hunters go in search of sunken riches. Draining the oceans reveals the richest wrecks ever found.