reporter: it was like a scene from star wars when climate scientist david holland finally made it tonsane fun and i thought i was going to die. we flew the helicopter through the crevasses. reporter: these eyes canyons are in the antarctic appeared it is the so-called doomsday glacier and you are seeing it in its death throes as close as anyone ever has. >> this is perhaps the most important glacier in the world in terms of its potential impact this century. reporter: the size of florida, it stores enough water to impact global seawater -- 10 fee if the ice is held in place. and here the ices melting at a stunning rate. 100 meters, more than 300 feet a year. how long can it last? >> that is the question we are pushing for -- we want to have an ice forecast. without that we have no insight into our future. reporter: holland is a professor at new york university. there, we watched some scenes from his epic voyage. year after year he risks his life in pursuit of elusive data. for starters, he wants to know the water temperature below the cracks but the probe holding the instruments is n

understanding this is crucial for david holland if he is ever to succeed at creating an accurate iceut for now, any crime of data helps, which brings us back to where we began with time and fuel just enough for a few extended flights, holland and his team flew to the open wound that thwaits and after the probes refused to penetrate the ice, they filled a few with shackles from the ship. >> we called it a shackleton bomb. [laughter] this heavy piece of metal, it creates a hole and then you throw the probe afterward. and that worked brilliantly. miles: they got a dozen readings. >> it is the first ever data from western thwaits. what we saw is data that the warmest water anywhere in an arc to -- antarctica is under thwaits. it is crazy warm for water near ice. miles: that is 40 degrees fahrenheit. you don't have to be a climate scientist to understand how serious that number is. it appears the ice forecast that david holland is so determined to create won't predict if, but rather when. until then, the world will have to wait and wonder how long the glaciers can teeter on this precipice

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