@cmconseils "While the legend might say the sword was put there by Arthur’s knight, Sir Bedivere, a man named Mark Wilkins claims it was in fact him.
“I threw it in the lake in the 1980s and wasn’t expecting to see it again,” Wilkins said. He said he threw it in the lake as an offering to the Celtic gods."

https://allthatsinteresting.com/truth-behind-excalibur