The Worlds Longest Transport Tunnels.

Length

Tunnel

Location

Kms

Miles

Opened

Seikan (underwater rail)

Japan

54

33.5

1988

Eurotunnel (underwater rail)

United Kingdom/France

48

31

1994

Moscow Metro

Russia
(Medvedkovo - Belyaevo)

31

19

1979

London Underground

United Kingdom
(Northern Line)

28

17

1939

Daishimizu (rail)

Japan

22

13.6

1982

Simplon II (rail)

Switzerland/Italy

20

12.4

1922

Shin-Karmon (underwater rail)

Japan

19

11.8

1975

Great Appenine (rail)

Italy

18.5

11.5

1934

St Gotthard (road)

Switzerland

16

10

1980

Rokko (rail)

Japan

16

10

1972

Henderson (rail)

USA

15.8

9.8

1975

This page came about when I was chatting with a friend and they mentioned a visit to France and using the Eurotunnel to get there. As I had a bridges page already, it seemed to make sense to include tunnels.