BravoXray
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Japan now has a railway tunnel that is a close second to the Gotthard Base Tunnel, the Seikan Tunnel at 33.4 miles (53.85 km). It is however, the longest underwater tunnel.
Seikan Tunnel: The World's Longest Tunnel That Dips Underwater Links Japan's Islands
Seikan Tunnel: The World's Longest Tunnel That Dips Underwater Links Japan's Islands