natalia zaremba did not like the measure of it.ather of her two boys. was this risk foolish? why do you put them on this dam. >> we put them on this dam because we want them to confront discomfort. we want them to confront their fears. >> reporter: nathan schmidt cofounded the mountain seed foundation charity. we met in the 700-square-mile park, where the dam, finished after world war ii, is a tourist attraction for rock climbers. >> what makes this safe, in your view? >> first off, we have professional mountain guides. the second thing is all the equipment we have, they train throughout the week on it. they know how to use the equipment. and particularly the little children, they are also short roped into a guide. so, there's multiple layers of security for them. >> reporter: and so, with all that security, the challenge was not so much under their feet as under their skin. >> and here we go. >> reporter: myroslav kpchenkov, who told us his late father never went back, always forward, was following his father's lead. >> you know,