tunnel

The Gotthard Base Tunnel goes under the Alps and has been called the world's longest tunnel. After 17 years, it's finally ready to be opened.

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Via: Ernest
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This is an athelete at the Wind Games which seems to be happening at an indoor skydiving facility in Spain

Via: CNN
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The G-Cans Project (formally known as the Metropolitan Area Outer Underground Discharge Channel) is the world's largest flood water drain facility located 50 meters below ground in the outskirts of Tokyo, Japan. Built between 1992 and 2009, the massive underground tunnel system is equipped with four jet-powered turbines and five gargantuan water silos that can drain floodwaters at an impressive rate of a 25-meter swimming pool per second.

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