An Arctic explorer says he is confident of success as he tries to repeat a 37-day trek to the North Pole.
Tom Avery says some of the ice has been like a "war zone"
Tom Avery, 29, of Ticehurst, East Sussex, is leading a five-strong team in an attempt to match a disputed 1909 expedition by Commander Robert Peary.
Some Polar historians claim it would have been impossible to complete the mission in 37 days.
But Mr Avery, who is promoting London's 2012 Olympic bid during his expedition, says he is "on track" to prove history.
He set out from Canada 27 days ago and, speaking from the Arctic Ocean on Friday, said the journey so far had been "tiring and exhausting".
Mr Avery's team is using 16 dogs to pull wooden sledges and other equipment which Commander Pearywould have used in 1909.
He was 54 when he claimed to have reached the North Pole in 37 days.
Despite some doubts about whether that was achievable at his age, Commander Peary's expedition was recognised by US Congress and the National Geographic Society.
Mr Avery is "convinced he did it" and says his team is "38 nautical miles ahead of Peary's position and have 10 days left to travel".
"We are looking to increase our distances over the next week," he added.
Mr Avery became the youngest person to reach the South Pole in 2002.
His current team have the London 2012 Olympic flag with them to help promote the capital's bid to host the games.