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As well as cold, wet conditions, soldiers had to contend with millions of rats which infested the trenches.
On two separate occasions in the past year, this Special Emphasis Program allowed OSHA compliance officers to remove workers from unsupported trenches minutes before they collapsed - likely preventing possible injury and loss of life.
Two trenches have been sampled over distances of 420 metres (Trench No 38) and 740 metres (Trench no 39).
The trenches were 150 to 160 feet long, 15 feet wide and 10 feet deep and were spaced about 35 feet apart.
For that reason, many geologists would love to visit a subduction zone, armed with the plate tectonic knowledge of how trenches form.
These Stokes trench-mortars were still putting up a tremendous barrage on the enemy's wire and trenches, and the enemy's artillery now opened out and commenced to bombard our line with big shells.
Trenching Services was recently hired to cut more than 25,000 feet of trenches for a new development near Idaho Falls.
The cleanup crews have found long concrete slabs, about 6 feet wide and 11 inches thick, that run the length of the trenches.
On Earth, deep trenches form when one plate- a patch of Earth's outer shell - dives beneath another.
Trenches ZSA-11 and ZSA-13 continue across strike to the west of ZSA-10 with approximately 50 meters between them.
EDWARDS AIR FORCE BASE - Excavation work is expected to begin next week on four filled-in trenches that were part of a World War II chemical warfare storage yard.
As the Pacific plate inches northwest, its leading edge dives into the mantle of the earth, forming some of the deepest trenches in all of the world's oceans.