They dug! As they were digging they used wood and bits of scrap metal (quite hard to come by, as they were needed to make guns) to hold up the tunnel and stop a cave-in.
Large earth moving equipment, explosives, drilling equipment, tunneling equipment, etc.
The 3 key technology the Axis used during World War 2 are:TanksGunsBombs
during World War II
the only one I can think of right now is the tank
Technology developed during the war was used for consumer products.
Scanning tunneling electron microscope
This is a pretty broad based question. A lot of technology wasn't used in WW1, primarily because it hadn't been developed. It would be easier to ask what technology was used.
Sapping referred to the method of digging tunnels underground to undermine enemy lines or defensive positions during World War 1. It allowed troops to approach their targets unseen and launch surprise attacks. Tunneling, on the other hand, specifically referred to the practice of constructing tunnels by specialist tunneling companies for various purposes, such as mining beneath enemy positions to plant explosives. Both tactics were used by both sides to gain an advantage in trench warfare.
Yes, scanning tunneling microscopes (STMs) can be used to see individual atoms on a surface. By measuring the current that flows between a sharp tip and the sample surface, STMs can create atomic-scale images with high resolution. This technology has been crucial in advancing our understanding of atomic structures and phenomena on the nanoscale.
genetic engineering
in the baking world industry technology is used in the testing of ingredients and equipment
Every country that participated in WW1 used technology.