At around 10:30am lifeguards rushed out on a jetski to help a man who had been struck by the propellor of a long tail boat after noticing he was in trouble in the water.
The man, who was still concious, was brought back to the beach on the jetski and was taken to Patong hospital with a deep slice to the back of his head. However, he was later transferred to Bangkok Hospital Phuket due to the seriousness of his wound.
According to lifeguards, the longtail boat continued out to sea after the incident.
The wounded man, named as Rudi Dann, 53, is believed to have been staying at the Jintana Andaman Hotel in Patong.
The longtail boat driver has since turned himself in to Karon Police Station.