Record: 53 km
Website:http://jr.hakodate.jp/global/english/train/tunnel/tunnel_omosiro.htm
Seikan Tunnel
Seikan Tunnel 2
Seikan Tunnel 3
Seikan Tunnel 4
Seikan Tunnel 5
Seikan Tunnel 6
Seikan Tunnel 7
Seikan Tunnel 8
Seikan Tunnel 9
Seikan Tunnel 10
