Two-time Olympic diving medallist Loudy Wiggins has stumbled on the comeback trail, missing out on the 10m final at the test event for the London Games.

The 32-year-old has returned to the sport following the birth of her now 15-month-old daughter Layla and more than three years out of competition.

The Athens bronze medallist in the platform finished a disappointing 14th in the semi-finals at the Olympic aquatics centre with a score of 295.00.

"I feel devastated. I clearly didn't dive well," she said.

"Physically I feel really good and I just need to maintain that to the Olympic trials in April."

The dual Commonwealth Games gold medallist in the 10m is vying to make her fourth Olympic team some 16 years after her debut at Atlanta in 1996.

The result in London was a let-down after finishing third at a World Cup event in Germany this month.

The Australian Olympic trials run from April 2-4 in Adelaide and Wiggins said she faced the toughest test of her career at national level. Only the top two divers will be picked.

Wiggins decided to come out of retirement last year after watching diving online.

"I said to my husband (Simon) I think I can still do it," she said.

"I said I think I can still be top six in the world on any given day."

She said a chat with compatriot and Athens gold medallist Chantelle Newbery convinced her to launch a comeback.

Newbery was a young mother at the time when she won the 10m title in Greece in 2004.

"I said 'What do you think?'," Wiggins said.

"She is probably the one that talked me into it and the logistics of how to do it.

"She was not the inspiration to do it but now that I am in this position I have a lot of respect for her."

Meanwhile, Australia's Ethan Warren qualified third for tomorrow's semi-finals in the three-metre springboard.

China's Qin Kai and He Chong led the way in qualifying.

Olympic Champion Matthew Mitcham is also in London to dive in the 10m platform event.

Mitcham felt he was still a few months away from being at his physical peak, but said his work with sports psychologists had opened his eyes and improved his mindset before the London Olympics, starting July 27.

"I am in such a massively different position than I was before Beijing," he said.

"The game is totally different. Before Beijing I did not even think I was in the running and now I am expected to defend my Olympic title." 

Mitcham said his study of the mental side of the sport had rekindled his "passion" for diving.

"I kind of lost it when I got injured," he said of an injury-plagued 2011.

"I had not competed for such a long time that I suppose my self-esteem had relied so much on getting all this positive feedback on such a regular basis.

"I had lost that but I have definitely got it back."

He was not too focused on his results this week at the Olympic aquatics centre.

"I am halfway (physically) to where I was in 2010 and ... I am not meant to peak in February," he said.

"I am meant to peak in July, so I have plenty of time up my sleeve, this is just about implementing those psychological tactics."

Tom Wald
AAP