Yachting - Sydney to Hobart Yacht Race - Sydney Harbour, Sydney, Australia, December 26, 2017. Yachts LDV Comanche and InfoTrack compete at the start of the annual 630 nautical miles (1166 kilometres) Sydney to Hobart Yacht Race on Sydney Harbour. REUTERS/Steve Christo 

Yachting - Sydney to Hobart Yacht Race - Sydney Harbour, Sydney, Australia, December 26, 2017. Members of the public watch the start of the annual 630 nautical miles (1166 kilometres) Sydney to Hobart Yacht Race on Sydney Harbour. REUTERS/Steve Christo 

Yachting - Sydney to Hobart Yacht Race - Sydney Harbour, Sydney, Australia, December 26, 2017. Yacht Beau Geste competes at the start of the annual 630 nautical miles (1166 kilometres) Sydney to Hobart Yacht Race on Sydney Harbour. REUTERS/Steve Christo 

Yachting - Sydney to Hobart Yacht Race - Sydney Harbour, Sydney, Australia, December 26, 2017. Yacht InfoTrack competes at the start of the annual 630 nautical miles (1166 kilometres) Sydney to Hobart Yacht Race on Sydney Harbour. REUTERS/Steve Christo 

Yachting - Sydney to Hobart Yacht Race - Sydney Harbour, Sydney, Australia, December 26, 2017. Owner of yacht LDV Comanche Jim Cooney stands on deck at the start of the annual 630 nautical miles (1166 kilometres) Sydney to Hobart Yacht Race on Sydney Harbour. REUTERS/Steve Christo 

Yachting - Sydney to Hobart Yacht Race - Sydney Harbour, Sydney, Australia, December 26, 2017. A crewman aboard the yacht Wild Oats XI stands on deck at the start of the annual 630 nautical miles (1166 kilometres) Sydney to Hobart Yacht Race on Sydney Harbour. REUTERS/Steve Christo 

Yachting - Sydney to Hobart Yacht Race - Sydney Harbour, Sydney, Australia, December 26, 2017. Yachts Black Jack and LDV Comanche compete at the start of the annual 630 nautical miles (1166 kilometres) Sydney to Hobart Yacht Race on Sydney Harbour. REUTERS/Steve Christo 

Yachting - Sydney to Hobart Yacht Race - Sydney Harbour, Sydney, Australia, December 26, 2017. Yacht LDV Comanche competes at the start of the annual 630 nautical miles (1166 kilometres) Sydney to Hobart Yacht Race on Sydney Harbour. REUTERS/Steve Christo 

Yachting - Sydney to Hobart Yacht Race - Sydney Harbour, Sydney, Australia, December 26, 2017. Yachts LDV Comanche and Wild Oats XI compete at the start of the annual 630 nautical miles (1166 kilometres) Sydney to Hobart Yacht Race on Sydney Harbour. REUTERS/Steve Christo 

Yachting - Sydney to Hobart Yacht Race - Sydney Harbour, Sydney, Australia, December 26, 2017. Yachts LDV Comanche, InfoTrack and Wild Oats XI compete at the start of the annual 630 nautical miles (1166 kilometres) Sydney to Hobart Yacht Race on Sydney Harbour. REUTERS/Steve Christo 

Yachting - Sydney to Hobart Yacht Race - Sydney Harbour, Sydney, Australia, December 26, 2017. Yacht Wild Oats competes at the start of the annual 630 nautical miles (1166 kilometres) Sydney to Hobart Yacht Race on Sydney Harbour. REUTERS/Steve Christo 

Yachting - Sydney to Hobart Yacht Race - Sydney Harbour, Sydney, Australia, December 26, 2017. Yachts Black Jack and LDV Comanche compete at the start of the annual 630 nautical miles (1166 kilometres) Sydney to Hobart Yacht Race on Sydney Harbour. REUTERS/Steve Christo 

Yachts sail out of Sydney Harbour during the start of the annual Sydney to Hobart Yacht race, Australia's premiere bluewater classic, in Australia, December 26, 2016. REUTERS/David Gray 

The yachts Perpetual Loyal (L) and Scallywag sail on Sydney Harbour during the start of the annual Sydney to Hobart Yacht race, Australia's premiere bluewater classic, in Australia, December 26, 2016. REUTERS/David Gray 

The crew aboard the yacht Perpetual Loyal react as they hit a wave sailing out of Sydney Harbour during the start of the annual Sydney to Hobart Yacht race, Australia's premiere bluewater classic, in Australia, December 26, 2016. REUTERS/David Gray 

The crew aboard the yacht Perpetual Loyal react as they hit a wave sailing out of Sydney Harbour during the start of the annual Sydney to Hobart Yacht race, Australia's premiere bluewater classic, in Australia, December 26, 2016. REUTERS/David Gray 

The yachts Wild Oats XI (R) and Scallywag sail out of Sydney Harbour during the start of the annual Sydney to Hobart Yacht race, Australia's premiere bluewater classic, in Australia, December 26, 2016. REUTERS/David Gray 

The crew aboard the yacht Scallywag react as they sail out of Sydney Harbour during the start of the annual Sydney to Hobart Yacht race, Australia's premiere bluewater classic, in Australia, December 26, 2016. REUTERS/David Gray 

Masts of yachts can be seen as they sail between waves out of Sydney Harbour during the start of the annual Sydney to Hobart Yacht race, Australia's premiere bluewater classic, in Australia, December 26, 2016. REUTERS/David Gray 

Yachts sail out of Sydney Harbour during the start of the annual Sydney to Hobart Yacht race, Australia's premiere bluewater classic, in Australia, December 26, 2016. REUTERS/David Gray 

The crew aboard the yacht Beau Geste can be seen as they hit a wave sailing out of Sydney Harbour during the start of the annual Sydney to Hobart Yacht race, Australia's premiere bluewater classic, in Australia, December 26, 2016. REUTERS/David Gray 

The crew aboard the yacht Perpetual Loyal react as they hit a wave sailing out of Sydney Harbour during the start of the annual Sydney to Hobart Yacht race, Australia's premiere bluewater classic, in Australia, December 26, 2016. REUTERS/David Gray 

The yacht Wild Oats XI (C) sails behind other entrants Perpetual Loyal and Scallywag (R) on Sydney Harbour during the start of the annual Sydney to Hobart Yacht race, Australia's premiere bluewater classic, in Australia, December 26, 2016. REUTERS/David Gray 

The crew aboard the yacht Beau Geste can be seen as they hit a wave sailing out of Sydney Harbour during the start of the annual Sydney to Hobart Yacht race, Australia's premiere bluewater classic, in Australia, December 26, 2016. REUTERS/David Gray 

The crew aboard the yacht Perpetual Loyal react as they hit a wave sailing out of Sydney Harbour during the start of the annual Sydney to Hobart Yacht race, Australia's premiere bluewater classic, in Australia, December 26, 2016. REUTERS/David Gray 

The crew aboard the yacht Perpetual Loyal react as they hit a wave sailing out of Sydney Harbour during the start of the annual Sydney to Hobart Yacht race, Australia's premiere bluewater classic, in Australia, December 26, 2016. REUTERS/David Gray 

The crew aboard the yacht Perpetual Loyal react as they hit a wave sailing out of Sydney Harbour during the start of the annual Sydney to Hobart Yacht race, Australia's premiere bluewater classic, in Australia, December 26, 2016. REUTERS/David Gray 

The Crown casino logo is pictured on the sail of the yacht Perpetual Loyal during the Big Boat Challenge on Sydney Harbour, December 13, 2016 before the annual Sydney to Hobart Yacht race to be held December 26. REUTERS/Jason Reed 

Helicopters fly over the yacht Scallywag participating in the Big Boat Challenge on Sydney Harbour December 13, 2016, before the annual Sydney to Hobart Yacht race to be held on December 26. REUTERS/Jason Reed 

The yacht Scallywag participates in the Big Boat Challenge on Sydney Harbour December 13, 2016, before the annual Sydney to Hobart Yacht race to be held on December 26. REUTERS/Jason Reed 

The yacht Scallywag (L) and Beau Geste race past the Sydney Opera House during the Big Boat Challenge on Sydney Harbour December 13, 2016, before the annual Sydney to Hobart Yacht race to be held on December 26. REUTERS/Jason Reed 

The yacht Pertual Loyal races past a Sydney ferry during the Big Boat Challenge on Sydney Harbour December 13, 2016, before the annual Sydney to Hobart Yacht race to be held on December 26. REUTERS/Jason Reed 

The yacht Pertual Loyal races during the Big Boat Challenge on Sydney Harbour December 13, 2016, before the annual Sydney to Hobart Yacht race to be held on December 26. REUTERS/Jason Reed 

The yacht Pertual Loyal races during the Big Boat Challenge on Sydney Harbour, December 13, 2016 before the annual Sydney to Hobart Yacht race to be held December 26. REUTERS/Jason Reed 

The yacht Pertual Loyal races during the Big Boat Challenge on Sydney Harbour December 13, 2016, before the annual Sydney to Hobart Yacht race to be held on December 26. REUTERS/Jason Reed 

(L-R) Yachts Scallywag, Wild Oats XI, Perpetual Loyal and Beau Geste race during the Big Boat Challenge on Sydney Harbour December 13, 2016, before the annual Sydney to Hobart Yacht race to be held on December 26. REUTERS/Jason Reed 

The yacht Wild Oats XI (R) leads Scallywag on its way to winning the Big Boat Challenge on Sydney Harbour December 13, 2016, before the annual Sydney to Hobart Yacht race to be held on December 26. REUTERS/Jason Reed 

The yacht Wild Oats XI leads the field towards the Sydney Harbour Bridge on its way to winning the Big Boat Challenge on Sydney Harbour December 13, 2016, before the annual Sydney to Hobart Yacht race to be held on December 26. REUTERS/Jason Reed 

The yacht Wild Oats XI leads the field past the Sydney Opera House on its way to winning the Big Boat Challenge on Sydney Harbour December 13, 2016, before the annual Sydney to Hobart Yacht race to be held December 26. REUTERS/Jason Reed 

The yacht Wild Oats XI leads the field towards the Sydney Harbour Bridge on its way to winning the Big Boat Challenge on Sydney Harbour December 13, 2016, before the annual Sydney to Hobart Yacht race to be held on December 26. REUTERS/Jason Reed 

A dirt road can be seen in a forest area where trees were recently cut down located on the outskirts of the Tasmanian capital city of Hobart, Australia, November 19, 2016. Picture taken November 19, 2016. REUTERS/David Gray 

Cricket - Australia v South Africa - Second Test cricket match - Bellerive Oval, Hobart, Australia - 15/11/16. South Africa's Kyle Abbott watches as team mate and wicketkeeper Quinton de Kock takes a catch to dismiss Australia's Mitchell Starc. REUTERS/David Gray 

Cricket - Australia v South Africa - Second Test cricket match - Bellerive Oval, Hobart, Australia - 15/11/16. Members of the South African team celebrate after defeating Australia. REUTERS/David Gray 

Cricket - Australia v South Africa - Second Test cricket match - Bellerive Oval, Hobart, Australia - 15/11/16. South Africa's Kyle Abbott hugs team mate Temba Bavuma after taking the wicket of Australia's Nathan Lyon to win the match. REUTERS/David Gray 

Cricket - Australia v South Africa - Second Test cricket match - Bellerive Oval, Hobart, Australia - 15/11/16. South Africa's Kyle Abbott celebrates with team mates after taking the wicket of Australia's Nathan Lyon to win the match. REUTERS/David Gray 

Cricket - Australia v South Africa - Second Test cricket match - Bellerive Oval, Hobart, Australia - 15/11/16. South Africa's Kyle Abbott watches as team mate and wicketkeeper Quinton de Kock takes a catch to dimiss Australia's Mitchell Starc. REUTERS/David Gray 

Cricket - Australia v South Africa - Second Test cricket match - Bellerive Oval, Hobart, Australia - 15/11/16. Australia's team coach Darren Lehmann shakes hands with members of the South African team after the match. REUTERS/David Gray 

Cricket - Australia v South Africa - Second Test cricket match - Bellerive Oval, Hobart, Australia - 15/11/16. Members of the South African team celebrate after defeating Australia. REUTERS/David Gray 

Cricket - Australia v South Africa - Second Test cricket match - Bellerive Oval, Hobart, Australia - 15/11/16. South Africa's captain Faf du Plessis hugs team mates as they celebrate after defeating Australia. REUTERS/David Gray 

Cricket - Australia v South Africa - Second Test cricket match - Bellerive Oval, Hobart, Australia - 15/11/16. South Africa's captain Faf du Plessis hugs team mates as they celebrate after defeating Australia. REUTERS/David Gray 

Cricket - Australia v South Africa - Second Test cricket match - Bellerive Oval, Hobart, Australia - 15/11/16. South Africa's captain Faf du Plessis hugs team mate Jean-Paul Duminy after defeating Australia. REUTERS/David Gray 

Cricket - Australia v South Africa - Second Test cricket match - Bellerive Oval, Hobart, Australia - 15/11/16 South Africa's Kagiso Rabada laughs as he celebrates with team mates and officials after the match. REUTERS/David Gray 

Cricket - Australia v South Africa - Second Test cricket match - Bellerive Oval, Hobart, Australia - 15/11/16 - South Africa's Vernon Philander (L) watches as team captain Faf du Plessis shakes Australia's captain Steve Smith's hand after the match. REUTERS/David Gray 

Cricket - Australia v South Africa - Second Test cricket match - Bellerive Oval, Hobart, Australia - 15/11/16. South Africa's Kyle Abbott hugs team mate Temba Bavuma after taking the final wicket and defeating Australia. REUTERS/David Gray 

Cricket - Australia v South Africa - Second Test cricket match - Bellerive Oval, Hobart, Australia - 15/11/16. South Africa's Kagiso Rabada celebrates with teammates after dismissing Australia's captain Steve Smith. REUTERS/David Gray TPX IMAGES OF THE DAY

Cricket - Australia v South Africa - Second Test cricket match - Bellerive Oval, Hobart, Australia - 15/11/16. South Africa's Kyle Abbott celebrates after taking the final wicket and defeating Australia. REUTERS/David Gray 

Cricket - Australia v South Africa - Second Test cricket match - Bellerive Oval, Hobart, Australia - 15/11/16. South Africa's Kyle Abbott celebrates after taking the final wicket and defeating Australia. REUTERS/David Gray TPX IMAGES OF THE DAY

Cricket - Australia v South Africa - Second Test cricket match - Bellerive Oval, Hobart, Australia - 15/11/16. South Africa's Kyle Abbott celebrates after taking the final wicket and defeating Australia. REUTERS/David Gray 

Cricket - Australia v South Africa - Second Test cricket match - Bellerive Oval, Hobart, Australia - 15/11/16 South Africa's Kyle Abbott celebrates after taking the final wicket and defeating Australia. REUTERS/David Gray 

Cricket - Australia v South Africa - Second Test cricket match - Bellerive Oval, Hobart, Australia - 15/11/16. Members of the South African team celebrate after defeating Australia. REUTERS/David Gray