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The off-duty firefighter was part of a group of four men in their 20s who had set out that evening to free dive, which involves swimming underwater without breathing apparatus or scuba tanks.

"We all like gaming," says Mr Boutflour, "and scuba diving is good training for working in space."

Ms Williams said scuba tanks and flippers were the most common finds but the rarest discovery yet was the first Lego shark ever reported.

He became a certified open water scuba diver at 13 and obtained his advanced open water certification later that year.

It’s waterproof and perfect for underwater adventures like scuba diving.