The body of the undergraduate who fell off his vessel into the choppy waters off Raffles Marina on Thursday has been found.

Mr Levin Angsana went overboard as his boat was heading back to the marina following a three-hour training session on Thursday afternoon.

He had been reaching over to try to retrieve the boat's sail, which had been caught by a gust of wind and had ended up in the water.

One of his crewmates, national sailor Renfred Tay, 23, jumped in after him and managed to grab him, but Mr Angsana apparently kept struggling. When Mr Tay left him momentarily to fetch a life jacket some distance away, he went under.

He was not wearing a life jacket although there were several on board. According to his crewmates, he was not a very good swimmer.

Mr Angsana is an information systems student at the Singapore Management University (SMU). A permanent resident originally from Indonesia, he is known to have previously earned a diploma from Singapore Polytechnic.

He took up sailing last year and joined the school team.