Channel Tunnel.
The longest undersea portion of any tunnel in the world.
The tunnel carries high-speed Eurostar passenger trains, the Eurotunnel Shuttle for road vehicles—the largest such transport in the world and international goods trains. The tunnel connects end-to-end with the LGV Nord and High Speed 1 high-speed railway lines.
Source: http://www.dailymail.co.uk/news/article-3454110/The-Channel-Tunnel-extended-time-opened-600m-covered-section-near-Calais-migrants-out.html
Not citing the source of photos(images) is plagiarism. Here is a post on why this is bad, and here is how easy it is to find allowed photos.
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Yes it is true this pic is in many place but i have write this article by my own hands its not copy past sir thank you.