And Fiennes will have GPS, satellite phones and support from the outside world, he says.
"I'm quite interested in characters that audiences have a hard time getting to like, " Fiennes said.
Fiennes takes the title role, with supporting actors including Gerard Butler, Vanessa Redgrave and James Nesbitt.
Before his latest adventure, 68-year-old Fiennes described polar exploration as a drug or addiction.
Fiennes does a good job too, although with his good looks he makes an unconvincing outcast.
He said Magwitch's boat escape scenes were being filmed with Fiennes on Thursday in Kent.
As the spurned hero, Mr Fiennes stomps off in his army boots, sleeps rough and plots revenge.
Fiennes' ability to roll the dice on risky characters does not surprise the film's director, Gillian Armstrong.
We start in the English countryside, on a sheep farm, owned and operated by Sir Ranulph Fiennes.
The Constant Gardener and The English Patient were both brilliant films, and Fiennes was brilliant in both roles.
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The other five members of the expedition will continue the journey without Fiennes as their leader, Medniuk said.
Although not everything comes off, Fiennes' bold, dynamic movie will make you glad he took up the challenge.
Sir David and Prof Hawking finished above explorer Ranulph Fiennes, Prince Charles and world wide web inventor Tim Berners-Lee.
Explorer Sir Ranulph Fiennes has pleaded guilty by letter to speeding on the A9 in the Highlands last year.
Fiennes' directorial debut, Coriolanus, will also receive a gala screening at the event.
In 2003, Dr Stroud completed seven marathons in seven days across seven continents alongside the explorer Sir Ranulph Fiennes.
Along with Neeson, who is brilliant, the standouts in the large cast are Ralph Fiennes, Ben Kingsley, and Embeth Davidtz.
Meirelles' next project is The Constant Gardener, starring Ralph Fiennes as an English diplomat in Kenya whose wife is murdered.
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Ralph Fiennes plays a refined but bumbling British diplomat who arrives in Kenya with his belligerent new wife (Rachel Weisz).
Among the other guests at the event were Colin Firth, Sir Ian McKellen, Ruth Wilson, Bill Nighy and Ralph Fiennes.
The expedition force is led by the man known as the world's greatest living explorer - 68-year-old Sir Ranulph Fiennes.
And so it continued, with Fiennes gradually earning more from writing and talking about his exploits, as his fame grew.
Those taking part included British auteur John Boorman, music video director Sophie Muller, documentary maker Sophie Fiennes, and photographer Nick Knight.
Scripted by One Day author David Nicholls, the film features Helena Bonham Carter as Miss Havisham and Ralph Fiennes as Magwitch.
Ralph Fiennes plays her husband in a clever and, one suspects, accurate portrayal of a chilly pragmatist bent on producing an heir.
In the films, Fiennes wears prosthetic make-up to distort his face but he says fans do still recognise him in the street.
But that is to sleight the contributions of Michael Gambon, Alan Rickman, Ralph Fiennes, Emma Thompson, Jim Broadbent and so many others.
Fiennes, who does not use Twitter, is not alone in his theory.
Sir Ranulph Twistleton-Wykeham Fiennes, an aristocrat whose lineage can be traced back to Charlemagne, originally hoped to emulate the career of his father.
Tessa Quayle (Rachel Weisz) is the wife of Justin (Ralph Fiennes), a young British diplomat with thin fingers and a way with petunias.
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