Come June the military is going to run some tests to the effects of study ground shock effects on deeply buried tunnels. To do this they will detonate 700 tons (a little less power than 600 tons of TNT) of heavy AN/FO in a shallow pit 65 miles north west of Las Vegas some time in the summer of 2006. Should be quite a bang but not the biggest done by the propeller heads That was in the 80’s it weighed in at around 4000 tonnes of AN/FO over at White Sands.