Recently, a friend of a friend was making a horror film that called for aa lightning strike to hit a graveyard, exploding in front a tombstone. I had been out of the explosives biz for a few years, but I called up my distributor for what was called a ground Moroon. I expected what I as used to get a few years earlier, a rather large, heavy device, about 6 inches wide, and 8 inches tall, wound in twine...but instead I was handed a rather petite little device, about the same size as a 35mm plastic film cannister, called a LaMatre. I was assured that it delivered the same "punch" but I , and the crew didnt believe it.
The day of the shoot, we erected a phony Tombstone, dug a 1 foot hole, placed the puny explosive in the bottom of the hole, and filled it back up with lightweight fullers earth and pieces of cork, since I was certain that it couldnt actually move any real earth.
I went to the other side of the old fence surrounding the cemetary, and waited for the cue to fire. I heard the cue, pressed the button, and the ground seemed to drop way from my feet, followed by a earth-shattering explosion that deafened me. I looked up from behind the fence, and saw the cameraman and his assistant flat on his back, and a hole where the explosion had happened about 10 feet wide. A huge Oak tree that had branches over the area, had a conical area stripped out where its branches used to be all the way up the tree. Leaves, bits of tree and dirt were raining down upon the area.
A few hours later when we finished, we headed back to our cars, parked around 100 meters away, only to find them covered with fullers earth, and leaves.
Lotsa power indeed!