A 65-year-old Florida man has spent his life searching for treasure off the coast—and Rick Schmitt and his family have just made their biggest-ever discovery.

Some 150 yards off the coast of Fort Pierce, and about 15 feet underwater, the Schmitt family found 64 feet of gold chain, five gold coins, and a gold ring; the haul has been valued at an estimated $300,000, the Orlando Sentinel reports.