New research revealing details of gold coins found aboard a shipwreck off Colombia provides further evidence that the vessel was the San José galleon, a 300-year-old Spanish warship believed to contain artifacts worth billions of dollars.

Considered the Holy Grail of all shipwrecks, the Spanish galleon San Jose blew up and sank in 1708 at the hands of British cannons, and it took with it what experts have estimated to be $17 billion in modern-day wealth, largely in the form of coins from 10 years of taxes saved up from the Americas. The shipwreck was first located in 2015.

Officials claim they used coins discovered inside a shipwreck off the coast of Colombia to prove the doomed vessel is the legendary San José that was carrying a $20 billion treasure when it sank. The Colombian government used an unmanned vehicle to inspect the wreckage of the 18th-century craft to prove it has found the lost Spanish galleon.