What is the longest underground tunnel in the world?

Linus

According to the following, it's the Seikan tunnel in Japan. It is 53.85km (33 miles) long, with a 23.3km (14.6) mile section underwater. The Channel Tunnel, by comparison, is 31 miles long, 23 miles of which are underwater. http://www.pref.aomori.jp/newline/newline-e/sin-e08.html http://www.raileurope.com/us/rail/eurostar/channel_tunnel.htm Apr 03 03, 7:20 PM

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On what line is the longest tunnel on the London underground and how long is it? What is the longest tunnel of the world? Where is the longest tunnel on Earth? Which city has an underground railway that has claimed to be the world's longest art gallery?

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