plate steel no problem

Probably spelt wrong. This is where a HE shaped charge is placed on a steel plate and detonated. The detonation causes the round plate to change to a cup shape and blast forewards cutting the hole as it blasts thro. Look at the bank at the back, the plate came to rest about 4' inside the rock. Blast wave. A low explosive is about 2-4 miles a second a HE one can be 6 miles a second. When you consider velocity, a fast military bullet is 3,200 ft/sec or be generous some may get to 1 mile sec. A low exp. is 2-4 mps. that is why the bomb is always deadly and it is 360 deg. effective. The above effect is also used in anti tank rounds as the plate INSIDE the tank comes away and goes whistling around inside up to 6 mps.