Scuba diver went on a mission to find a diamond ring someone threw in the water in a TikTok video

One resilient scuba diver went on the mission of a lifetime to find an abandoned diamond ring in a US river.

Watch below:

Commenting on the clip people were half-joking that they were going to dive in to have a look.

I'm sure Gollum would be impressed with this level of commitment.

Once he finally arrived, the YouTuber opted to use a metal detector to find the rings and, at first, he really did not have the best of luck.

He only managed to find some loose change, a fork and an iPhone.

That 10 hour drive was starting to look like a massive waste of time.

However, after persevering in the waters, he eventually, somehow, located the woman's real ring.

“The big one!” Koehler said.

“It’s real, I thought she could’ve faked it.”

Sharing an update with his subscribers, the influencer wrote: "I contacted the owner and asked if she wanted her ring back and she declined.

"I told her she can have it back at anytime if she changes her mind.

"I just wanted to make a cool video. She thought it was neat."

Commenting on the viral video, one user thought: "Finders keepers, sell it, get better equipment for your cause. You already offered to give it back & she declined.

"A perfectly reasonable amount of time has elapsed for you to do with it as you please. It's your property.

"You certainly put in the work to find & obtain it. It's yours. Good hunting! Much love to ya."

Another person suggested: "Keep it til you have the right time to marry your girlfriend."