A three-man team is bidding to survive a week on a rock, dubbed Britain's loneliest outpost, 260 miles west of the Outer Hebrides.
The aim of the expedition to Rockall this June is to raise money for The Royal Navy and Royal Marines Charity and ABF The Soldiers' Charity with the target of making £50,000.
Favourable weather conditions will be key to scaling the isolated rock, officially part of the Isle of Harris, and set up camp.