Severn Tunnel, Railway tunnel between South Gloucestershire and Monmouthshire, United Kingdom.
The Severn Tunnel is a railway passage running beneath the River Severn that connects England and Wales, stretching more than 7 kilometers under the water. Its construction required approximately 76 million bricks to create this underground crossing.
Construction began in 1873 under engineer Thomas Walker and was completed in 1886, despite major challenges from flooding caused by underground springs. The project marked a turning point in 19th-century engineering and showed new possibilities for underwater tunnel construction.
The tunnel replaced centuries-old ferry services that once crossed the River Severn, fundamentally changing how people and goods moved between England and Wales. This passage remains a vital link in how the two nations connect today.
The tunnel requires constant maintenance to remove water and keep operations running, as underground springs continuously push water into the passage. Hundreds of trains travel through daily, so check train schedules if you visit the area.
The tunnel held the record as the world's longest underwater passage for over a century until newer projects surpassed it in the 1980s. In its early years, steep gradients in certain sections required special locomotives to pull trains through the tunnel.
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