kind of video that we came across there on youtube what comes to mind for you? >> immediately, it was my own experience in '99 when a large block of ice many miles above us released and then came down. so in the instance of this avalanche, there was a hanging glacier, so there's a glacier with a big cliff below it between pimori and lanetrain and when that earthquake triggered that many tons of ice came down accelerated over a vertical cliff and then hit the slopes below it. so it picked up along the way, the wind blast that we saw in that video. >> wow. you know, when we look at this video again, you know on base camp and you can describe better than anyone what it is like. this is the area where dozens of trekkers in their camps, they -- they are there getting their bodies acclimated before they make their big ascensions up in this case mount everest.