Police divers pulled the dead man from the lake at lunchtime on Wednesday (April 6) after he was seen floating in the water.
Police say the body is believed to be 18-year-old Mr Soh who was last seen at 11pm on March 22 in the grounds of Imperial College, London, where he had been socialising with friends.
The death is not being treated as suspicious.
A boat worker, who wanted to remain anonymous, said he discovered the body while working on the lake.
“We had a few customers out on the lake and someone pointed out that there was something over there so I went and had a look,” he said.
“It was just floating on the other side of the island. It was caught on one of the chains.
“We knew there was someone missing and there was a possibility they were in the lake.
“I talked to them (the police) earlier and just went down and said I think we might have found it.”
Visitors enjoying strolls in the park on the warmest day of the year so far were told to move away as police put a cordon up around the immediate area.