World Champion Trials bike rider Jack Field of Australia poses after performing the highest backflip on a motorcycle ever recorded as he flips his motorbike upside down on the roof of Melbourne's Eureka Tower (297.3 metres) during a AUS-X Open media opportunity at Eureka Tower on May 22, 2019 in Melbourne, Australia. The largest international Supercross and action sports event in the world outside of the USA, the AUS-X Open will be held at Melbourne's Marvel Stadium on November 30 2019. (Photo by Scott Barbour/Getty Images)

The HMAS Adelaide is scuttled off the coast of Avoca Beach on April 13, 2011 in Gosford, Australia. After the scuttling was succesfully protested in 2010, today the HMAS Adelaide was finally scuttled off the NSW Central Coast to create an artifical reef, the first of its kind in this state. (Photo by Brendon Thorne/Getty Images)

A bodyboarder rides a wave at Mackenzies Bay on May 1, 2011 in Sydney, Australia. A strong east-south-east swell has developed along the NSW coastline with waves between 6ft and 8ft expected to hit the coast for much of the weekend and into next week. (Photo by Cameron Spencer/Getty Images)

A model prepares backstage ahead of the Amber & Thomas show during Rosemount Australian Fashion Week Spring/Summer 2011/12 at Overseas Passenger Terminal on May 3, 2011 in Sydney, Australia. (Photo by Ryan Pierse/Getty Images)

Artwork by Ruth Bellotti & Steve Rosewell called “Soldier Scale 1:1” is seen at the 2008 Sculpture by the Sea launch at Mark's Park, Bondi on October 15, 2008 in Sydney, Australia. (Photo by Gaye Gerard/Getty Images)

Lady Gaga arrives at Nevermind Nightclub on July 11, 2011 in Sydney, Australia. Lady Gaga fans gathered outside two Sydney nightclubs in hopes to catch a glimpse of the singer after she sent a cryptic tweet suggesting her she'd be stopping by the venues. (Photo by Marianna Massey/Getty Images)

Rowan Atkinson poses with Shaolin Monks at the “Johnny English Reborn” world premiere at The Entertainment Quarter on September 4, 2011 in Sydney, Australia. (Photo by Lisa Maree Williams/Getty Images)

3D interactive artist Joe Hill poses with one of his works as part of the VisitBritain tourism campaign at Circular Quay on September 6, 2011 in Sydney, Australia. (Photo by Mark Metcalfe/Getty Images)