It was six weeks into his time as a business student at the National University of Singapore (NUS) in 2012 when he had the accident that would change his life.
Mr Alwyn Keng had turned up at one of the pools on campus to prepare for an inter-hall swimming competition. Like so many times before, he jumped off the starting block and plunged into the pool.
But something went wrong this time. "I sank to the bottom of the pool. I couldn't move and shout for help, I just had to hold my breath and pray for the best," said Mr Keng, now 27.
He has no explanation for what happened, but is certain that he did not hit the bottom of the pool after diving in.
An alert friend noticed he was underwater for too long, and dived in to pull an unconscious Mr Keng out.
When he came to on land, he realised he could not move any part of his body below the neck.
He was rushed to hospital by ambulance.
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"Everything happened so quickly. I was in shock and didn't know what was happening. Everyone was just rushing around," said Mr Keng.
At the hospital, doctors found that he had somehow fractured his neck and shattered a bone during the "freak accident".
The injury affected his spinal cord, impairing his movements.
But worse news was to come in the months during his recovery. He was told that he was likely to be permanently disabled.
"I initially thought that I would be fine after they removed the bone fragments that were affecting my spinal cord, but when I read up on my condition, I realised it's not as easy as that," he said.
While he regained some use of his hands and upper body after several months of rehabilitation, he remains paralysed from his waist down - a condition that is likely to be permanent, he said.
IT'S ALL RIGHT TO BE DIFFERENT
We shouldn't be afraid to be different. We just have to learn to accept it and move on.
This realisation came as a huge blow to Mr Keng, an active student who represented his hall of residence at NUS in swimming, handball and football.
"I was shocked. I remember feeling helpless and quite devastated. I used to do a lot of sports, so it felt like a huge part of my life had been taken away from me," he said.
Since he was in primary school, he had been active in sports, often playing basketball or football during recess or after school, he said.
In National Junior College, he was a member of the school's track and field team, as a discus thrower.
As he struggled through rehabilitation to recover as many body functions as possible, he started to doubt his ability to return to school to "lead a normal life" again.
"I was scared. I used to be quite confident and sporty, but after such a traumatic injury, my confidence took a hit. I was uncertain how people would view me," he said.
"I think I had a bit of an inferiority complex, since I thought I couldn't be the person I used to be."
But he had the support of Dr Helen Chai, assistant dean of NUS Business School, who visited him frequently while he was in hospital, to persuade him to return to school.
Dr Chai even arranged for him to drop by the school to attend a lecture, just to get a feel of the school environment again, Mr Keng said.
It took a lot of convincing, but in the end, he "gave in to her nagging" and decided to return to school.
In December 2013, after his discharge from hospital, Mr Keng resumed his studies.
To his surprise, he managed to do well in his first semester, scoring two As and a B for the three modules that he took.
That turned out to be the confidence booster he needed.
"It was evidence that I could achieve so much more - since I managed to recover to the extent that I could go back to school and do well in my (studies)," said Mr Keng.
He saw his studies as a way to have a "future to look forward to", in spite of his disability.
By then, he was able to get around the school independently in a wheelchair and had largely regained control of his upper body.
His father would also drive him to school and back to their Housing Board flat in Choa Chu Kang.
He was determined to do well for the sake of his parents.
Both his parents are 55 years old now. His father works as a freelancer in advertising while his mother works at a bank. He has a younger brother aged 26 who just graduated from the Singapore University of Social Sciences.
Over the next four years, Mr Keng worked hard, often sleeping less to prepare for classes.
In 2014, he received the Asia Pacific Breweries Foundation Scholarship for Persons with Disabilities for his good results in school.
He later joined the NUS Enablers club, a student interest group for special needs students, and became its vice-president.
A former hall mate, Mr Justinn Leong, 29, said he has seen Mr Keng mature in the years since his accident. It was Mr Leong who pulled Mr Keng out of the pool in 2012.
"You would expect the person to start thinking that the world has abandoned him and that he has no control over life," said Mr Leong.
"But, on the contrary, Alwyn has always seemed to have control over his own life. He knows he won't let his past stop him from achieving what he wants to achieve."
Mr Keng graduated with top honours from NUS last year, two years after his peers graduated, and is now working as a bank analyst at HSBC.
Looking back, he credits his family and friends for creating a strong support system. Through it all, his friends and family never gave up on him. "I had to repay their faith in me," he said.
He hopes his story shows that people with special needs are just as capable. "All it takes is a bit of patience and some special arrangements to level the playing field," he said.
For example, his university made arrangements for him to take his examinations on a computer.
The bank, too, has ensured that his working environment is a wheelchair-friendly one.
The biggest lesson he has learnt, which he hopes others will share, is to accept that everyone is different.
"Everyone goes through life at a different pace; there's no blueprint for when and how we should live our lives.
"We shouldn't be afraid to be different. We just have to learn to accept it and move on."
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