Anyone who watches TV, especially Mythbusters, will have heard the expression “Fire in the hole”. It is usually called out before a blast or explosion is deliberately detonated, warning those present to take cover.
Having wondered why someone pushing down the plunger on a detonator that looks like an upright shoebox would shout out “Fire in the hole” rather than “Watch out” or something similar, I looked it up.
It turns out that it is a leftover from the days when armies fought by walking towards each other into cannon fire and rifle shot, playing drums and fifes. You can see such battle scenes in Barry Lyndon.
The cannon in those days were simple. You took a big metal tube and put gunpowder into it. Then you put in a cannonball or lots of metal shrapnel. Then you put wadding down the tube, tamping it down with a big stick with a big lump on the end (impressed with my military jargon and technical talk?).







