we are finally in sardinia. almost. the route is really intimidating. so, it goes up and to the left. >> it's dangerous. >> reporter: the new climb is perfectly named. a madman's journey. it's 1 tho,000 feet of climb in. it's near impossible. >> it's actually happening, man. i get to the wall, it actually kind of all of a sudden hit me, like, what are we getting into? >> reporter: so few people attempt this climb. sasha and her partner spent days just exploring a wall reclaimed by nature. >> you are essential trusting your life to this person's hands. and when you think about it, it's pretty hefty stuff. climbing is full of failure. each success comes in really small doses. i don't want to do this. i just can't. >> reporter: every moment of desperation captured on film. >> you are having to really contort yourself in order to stay still and to get these shots in a certain way. >> and that's tough when you're up there, so, you know, these harnesses start to wear on you after awhile and you're squirming around a lot. you are -- all the blood seems to be r