The Australian pair of James Castrission and Justin Jones planted the country's flag at South Pole on Dec 31, 2011, to mark that they reached the bottom of the world on foot.

The next feat of the Australian adventurers is to ski 1,100 kilometres back to the coast and catch the last flight out of the continent before winter storms catch up on them.

Messrs Castrission and Jones walked 1,150 kilometres for 61 days lugging 160 kilogrammes of gear through blizzards which delayed their journey by 10 days. As a result the pair had to ration their food supplies and have 28 days left to ski 1,100 kilometres back to coast.

In preparation for their adventure, the two men added 20 kilogrammes by eating the calorie equivalent of 15 beef burgers a day. However, the delay caused them to ration their food supplies.

"We're down to half rations so it's really going to be quite a difficult journey to get back," Mr Castrission

The two men had lost about 15 kilogrammes each. Mr Jones is also suffering from pain due to infection on his toes.

The pair had previously made world record in 2008 by becoming the first to kayak to New Zealand from Australia.