he says steep and dangerous climb back out a unique experience. it might not be possible to do this in the foreseeable future . those mock up with nothing actually makes me think if you bear in mind that researchers say that none of this will be here any more in 90 years time. we are all more glaciers maybe that's pretty tragic isn't it this is turning into me even with that all to show. the arch glance here in valet switzerland is the largest in the out. 20 kilometers long and in parts nearly one kilometer think. of a from the swiss federal institute of technology in zurich is researching this