1 SIM student still missing at sea
He was perched on a board about 2.5 metres long, with only a paddle, off Changi on Sunday.
On Monday, at about 2.15pm, only the board and the paddle were found by rescue boats about 500m offshore from the National Service Resort & Country Club (NSRCC).
Undergraduate Goh Chuan Kiet, 23, remained missing despite search-and-rescue operations - first by sailors from the Constant Wind Sailing School and Sea Sports Centre, followed by the Maritime and Port Authority of Singapore (MPA).
Mr Goh had set out on Sunday afternoon with members of the Singapore Institute of Management (SIM) Windsurfing Club, said an SIM Global Education spokesman.
The business degree student with the Royal Melbourne Institute of Technology at SIM, is understood to be a stand up paddleboarding enthusiast.
Mr Ho Kah Soon, director of Constant Wind, said he was alerted to the incident by a fisherman at about 2pm on Sunday.
Mr Ho, who was among Singapore's top boardsailors in the 80s, said: "While a boat was fetching the group out at sea, a fisherman came to the centre and told us something had happened, but he couldn't describe what exactly happened.
"We noticed a small storm around the area, but we were not sure if it was near where the group had been. We immediately sent five rescue boats."
Mr Ho estimated that the group of 15 students were at least 500m from the shore.
Said Mr Ho: "We contacted the coast guard after failing to find the missing student."
The MPA has been coordinating the search-and-rescue efforts since 2pm on Sunday.