Swimmer Paul Westlake thought he had seen the last of his wallet when it vanished during a late night dip - until it turned up in the claws of a lobster.
The 30-year-old's wallet was handed in a few days later by a diver, who had caught the lobster and found the creature firmly grasping it.
The diver, whose identity so far remains a mystery, handed the wallet into a hairdressing salon after finding a business card among the contents.
After being reunited with the wallet via the salon, Mr Westlake, from Milehouse, Plymouth, said he wanted to meet and thank the diver.
He said: "I have never eaten a lobster and I never will now."
The wallet vanished when Mr Westlake and his 31-year-old brother Paul went for a swim in Plymouth Sound after drinking in a local pub.
It came to light again when the diver got in touch with the Associates hairdressing salon in Plymouth, which Mr Westlake uses.
He collected it there, and found that bank cards it contained still worked despite immersion in sea water and the attentions of the lobster.
Amy Harvey, who has worked at Associates for two years, said: "We were contacted by a diver who said that he had found a wallet with our details inside.
"We actually thought it was a joke when he rang. He said it was found in the claw of a lobster, which has now been eaten."