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One of the world's earliest underground tube railways opened in the Tower Subway (interior depicted), a tunnel beneath the River Thames in London.
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Tower Subway
Tunnel beneath the River Thames in Central London, England
The Tower Subway is a tunnel beneath the River Thames in central London, between Tower Hill on the north bank of the river and Vine Lane on the south. In 1869 a 1,340-foot-long (410 m) circular tunnel was dug through the London clay using a cast iron circular shield…Source: Wikipedia (CC BY-SA)
River Thames
River in southern England
The River Thames, known alternatively in parts as the River Isis, is a river that flows through southern England including London. At 215 miles (346 km), it is the longest river entirely in England and the second-longest in the United Kingdom, after the River Severn.Source: Wikipedia (CC BY-SA)