Publishedduration3 hours agoshareSharenocloseShare pagelinkCopy linkAbout sharingimage copyrightScience Photo Libraryimage captionThe surfer said he had been enjoying a "normal day's surfing" when he was attacked by a great white shark

A surfer in Australia who was attacked by a great white shark has described the experience as like being "hit by a truck".

The 29-year-old was surfing in waters around Kangaroo Island off the Adelaide coast, when he was attacked on Sunday.

He suffered serious injuries and was said to be lucky to be alive.

After the attack at remote D'Estrees Bay, he managed to swim back to shore, before walking another 300 metres (328 yards) to get help.

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Describing his ordeal in a handwritten letter, he said he believed he would make a full recovery.

He had, he said, been sitting on his board when he felt a hit on his left side: "It was like being hit by a truck."