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the ants dig tunnels that rarely collaspe by spreading silk(from larvea), saliva and feces over tunnels dug with their jaws.
so they can start it from underground
Termites
Because they had secret rooms within the tunnels and hid goods in there. Also none of the robbers knew there were tunnels in the pyramid so it was a good place for the Pharoh's to be buried and to keep special stuff in.
The invention of a stable form of nitroglycerin, dynamite, in 1869 made the construction of tunnels for such historic rail lines as the Union-Pacific transcontinental route more practicable.
Hkfu
They built underground tunnels leading to a water well outside the palace gates.
They live in the ground, unlike squirrels. They also build tunnels to scurry around in.
The Cu Chi tunnels are a large network of underground tunnels in Ho Chi Minh City (formerly Saigon). The tunnels were originally constructed from 1946-1954 as a hiding place for the Viet Minh, nationalist guerillas who fought the Japanese during World War 2 and then France. More tunnels were constructed during the Vietnam War to serve as hiding spots, communication, and supply routes for soldiers. The Cu Chi Minh tunnels are part of the overall network of tunnels that underlie much of Vietnam.
The Cu Chi tunnels are a large network of underground tunnels in Ho Chi Minh City (formerly Saigon). The tunnels were originally constructed from 1946-1954 as a hiding place for the Viet Minh, nationalist guerillas who fought the Japanese during World War 2 and then France. More tunnels were constructed during the Vietnam War to serve as hiding spots, communication, and supply routes for soldiers. The Cu Chi Minh tunnels are part of the overall network of tunnels that underlie much of Vietnam.
One cannot build a battery isolator. However, one may rewire a battery isolator. The plans to do that can be found on do it yourself sites such as DoItYourself.
There are many tunnels under the Thames - including several used for trains.