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A Trench
That's not enough information. You need to know the width of the trench, and how much volume 1 ton of gravel is equivalent to.
volume of trench = 10' x 3' x 54' = 1620 cubic feet therefore 1620 cubic feet of concrete will be required.
The depth is less important than the proper shoring up of the trench sides. Even a shallow trench can collapse and trap a worker if the sides are not shored up properly.
The tench shape was in a zig-zag shape, it was never in a straight line
It depends how big your shovel is. Then, it depends if the dirt is dry or moisty, which can effect everything. and the answer is 360 because 1*3*6= 18 then multiply that by 20. 18*20= 360. your welcome guys.
It will be alot of work but you can always use sandbags and shovels to build a trench.
"subduction"
The Puerto Rico Trench is an oceanic trench located on the boundary between the Caribbean Sea and the Atlantic Ocean. The island of Puerto Rico lies immediately to the south of the fault zone and the trench. The trench is 800 kilometers (500 mi) long and has a maximum a depth of 8,605 meters (28,232 ft) at Milwaukee Deep, which is the deepest point in the Atlantic Ocean.
They were constructed by the men, they had their shovels and they would just keep on digging and digging and they wouldnt stop. and it led to trench foot and it also prolonged the war which is also called stalemate.
Because the soldiers would dig tunnels and if the tunnels caved in that would create a bunker.
400 miles
Dig a trench about five feet long and 3 feet deep.Lay about 6 or 7 boards you can find across the end of the trench.Find a piece of plywood about the area of all the boards and lay it on top of the boards.Cover the plywood with the dirt from the trench, therefore camouflaging the whole thing.
Shoring of a trench or excavation can cause a caught-between hazard.
Shoring of a trench or excavation can cause a caught-between hazard.
It was much easier to defend a trench because you were behing cover and camped in to your position unlike the attackers who were running across open plains and were constantly loosing men and getting shot down by machine gun fire.
During WWI, in trench warfare, German armies dug holes in the ground that were 6 to 8 ft. tall, and wide enough that 2 soldiers could walk side by side at the same time! Trench warfare was fought by one group of soldiers advancing across no mans land to assault the enemy trench quickly, before returning to their trench to apply defensive fire on the enemy, who has retaliated by assaulting their trench. Then the enemy return once fire has ceased. Then they wait for the next move to be made.