The Top 5 Longest Underwater Tunnels

  Tunnel Location Length (meters) Length (feet) Year Completed
1 The Seikan Tunnel Japan 53,850 m 176,673 ft 1988
2 The Channel Tunnel England/ France 50,450 m 165,518 ft 1994
3 The Shin-Karmon Tunnel Japan 18,680 m 61,286 ft 1975
4 The Tokyo Bay Aqua-Line Expressway Japan 9,583 m 31,440 ft 1997
5 The Great Belt Fixed Link Denmark 8,024 m 26,325 ft 1997
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 Facts
  1. The 54km-long Seikan Tunnel links the Japanese islands of Honshu and Hokkaido and took 24 years to complete.
  2. 39 km of the "Chunnel", as it is known, is underwater.
  3. As of 2006 the toll for the Aqualine expressway was 3,700 yen (about $31 US dollars).
Tags: Transportation, Top 5 Longest

Sources:  Various

List Notes: 
Longest Underwater Tunnels

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