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Туннельный сложно Tunneling is difficult,expensive and dangerous engineering work.
Tunnels are built to provide direct automobile or railway routes through mountain ranges,under or over rivers.
They can also provide underground channels for water, sewage or oil.
Before the 19th century men had not acquired enough skill in engineering to carry out extensive tunneling.
Tunnels,however, were known in ancient times.
They were, for instance, driven into the rock under the Pyramids of Egypt,and the Romans built one in Rome for their chief drain,parts of which still remain.
One of the earliest tunnels known was made in Babylon.
It passed under the Euphrates river, and was built of arched brickwork ring 12 feet high and 15feet wide.
Other ancient tunnels were built for water supply and for drainage.
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