For thousands of years, gold has been the most treasured and coveted of all metals. But extraction sites are dwindling and what little gold that remains is harder and harder to mine. However, there is a place where you can still find vast quantities of gold. Underwater archaeology has revealed that 3 million shipwrecks litter the ocean floor, 3,500 of which sunk with cargoes of ’precious metals’ onboard. Billions of dollars worth of gold, just sitting there, at the bottom of the sea. With today’s technology, this gold is in reach.

• Documentary