Babylonians dug a 3000-foot-long tunnel under the Euphrates River, around 2180 BCE. The tunnel,
Babylonians dug a 3000-foot-long tunnel under the Euphrates River, around 2180 BCE. The tunnel, presumed to have been used by chariots as well as pedestrians, connected the royal palace with a major temple on the opposite bank. And you can still see it today! -- source link
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