A stuntman is preparing to leap from a helicopter at a height of 2,400ft (730m) - without using a parachute.
Gary Connery, from Henley-on-Thames, Oxfordshire, will attempt the stunt this week, weather permitting, wearing a specially developed wingsuit.
The 42-year-old will make the jump above Ridge Wood in Buckinghamshire and land in an area containing a stack of 18,600 cardboard boxes.
"No-one has ever attempted this before, but I will do it," he said.
Mr Connery has worked closely with Tonysuits to develop a suit which will enable him to fly at slower speeds and land without a parachute.
The father of two, who has already completed about 880 skydives and 450 base jumps, has been working on the precision and accuracy of the suit in Switzerland, Italy and America.
"I've been doing lots of base jumping wearing the wingsuit, flying close to cliffs and treetops to get familiar with the ground rush," he said.