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.
For proper drainage in your backyard, you should dig a trench that is at least 12 inches deep.
The trench is 35,600,056 ft deep
the answer i Izu the trench
Marianas Trench
It is in the Mariana Trench!
about 6 miles deep
First off, its Mariana Trench, and it is at 11,033 meters (36,201 feet) deep
The Hellenic trench is about 5000 meters or 16404 feet at the Matapan Deep system.
35 838ft/10 923m deep. the deepest point in the trench is the challenger deep
a modern military trench should be 2 inches above the tallest mans head. So if you 5 foot exactly u need a 5 foot 2 inch trench.
its 3 inches deep