[lepton]

"According to legend, the pearl was lost in a shipwreck centuries ago, then found in 1934 off Palawan Island in the Philippines by a diver who drowned when he reached into a huge clam to take it."

[FoxInSocks]

Ohhhh, I see. I thought the legend simply sounded silly, but I didn't see how illogical it was. Maybe a clam gobbled it up after the ship wrecked, or something.

One site I found says Tridacna gigas can live up to 40 years.