so steef, p, so remote. >> it's only been done by two men before and that was over a decade ago. >> reporter: that they can even rattle one of the best climbers in the world. >> my heart is in my throat. it's too dangerous to fall. you can't fall. i'll try to be the first woman to do this climb. >> are you afraid of heights? >> no, i'm not. i think it would be really hard to be doing this if i was afraid of heights. >> reporter: at just 21, this world champion rock climber and ivy league junior isn't satisfied unless shell's on top. >> what are you afraid of? >> i'm afraid of sharks. i have small fears, but i don't like feeling not in control. when you're on that edge, you're in control of your own destiny there. >> reporter: sasha is on a mission to redefine what's possible. >> we're at the wall. it's one of these. >> reporter: a year of planning and training, bringing her and a team of expert climbers to the swiss alps. >> sasha is the forefront of female rock climbers. she's certainly one of the best in the world. >> reporter: one of her sponsors, red bull, hopes to film her attempt to cl