Alex Brace was enjoying a dinghy trip when he spotted this huge shark in the waters around him.
He was out with a pal in the sea off Tenby when they noticed two fins poking from the depths.
Mr Brace, from Pembrokeshire, believes the animal was a basking shark of about 12ft (3.6m). They can grow more than 33ft (10m).
"They are normally in deeper water, so if it was a basking shark, then that was really rare," he said.
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