here it is for our viewers. it may not be news to some of on our viewers, but for those who just joined it, it will be. what does that suggest to you? >> we've seen the explosion that took out the outer -- the upper structure. so now we just have a melting frame where it looks like the other three which are still intact on the site. and whenever there is an explosion on that floor today, there is a cloud, a very small particle of smoke which happens for some time. we remember the terrible pictures of 9/11 in new york for example where the buildings collapsed. there was a very large dust cloud. it need not be more than just what you would expect whenever any structure of that size collapses in that kind of way. the questions that we don't know about is not so much what's happened above the ground. the working parts are put under the ground. it's what is happening just