A New England Aquarium diver returned a man’s lost wedding ring he found in the aquarium’s four-story, 200,000-gallon giant ocean tank – more than three months after it was lost.

Bob Pirrmann was enjoying a rare public dive in the Caribbean coral reef exhibit which is filled with giant sea turtles, large sharks, electric green moray eels and more than 700 other marine creatures. It was during this time that he lost his wedding ring. He thouht he would never see it again.

Then one day a diver named Mike Whyte was vacuuming food debris from several inches of sand near the bottom of the tank on Sunday when he discovered the ring.

Whyte first thought the round object was a coin.

“I was vacuuming in between, of all things, finger coral, and I noticed a round shape. At first, I thought it was a quarter. But, as I put it down a second time — instantly — it came to my mind, ‘I know what this is!’” Whyte said.

Now Pirrman has decided to never part with his beloved ring which had been missing for three months. Unless that is, if he decides to go diving.

“However long I live, it’s going to stay on my finger,” Pirrmann said.