UK,
2020, 5 h 35 min
(Length: 41–42 min)
Episodes(8)
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Dubai's Impossible Island (S07E01)
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World's Toughest Tunnels (S07E02)
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F-35 Fighter Jet (S07E03)
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NYC Mega Tower (S07E04)
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World's Biggest Airport (S07E05)
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Spy Plane Declassified (S07E06)
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World's Highest Bridge (S07E07)
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Conquering Avalanche Country (S07E08)
Gallery (108)
World's Toughest Tunnels (S07E02)
Photo © Discovery Networks
![Impossible Engineering - Season 7 - World's Toughest Tunnels - Photos](http://image.pmgstatic.com/cache/resized/w663/files/images/film/photos/168/722/168722131_k5ux98.jpg)
World's Toughest Tunnels (S07E02)
Photo © Discovery Networks
![Impossible Engineering - Season 7 - World's Toughest Tunnels - Photos](http://image.pmgstatic.com/cache/resized/w663/files/images/film/photos/168/722/168722132_6pubhb.jpg)
World's Toughest Tunnels (S07E02)
Photo © Discovery Networks
![Impossible Engineering - Season 7 - World's Toughest Tunnels - Photos](http://image.pmgstatic.com/cache/resized/w663/files/images/film/photos/168/722/168722133_zqsapq.jpg)
World's Toughest Tunnels (S07E02)
Photo © Discovery Networks
![Impossible Engineering - Season 7 - World's Toughest Tunnels - Photos](http://image.pmgstatic.com/cache/resized/w663/files/images/film/photos/168/722/168722134_jfgvip.jpg)
World's Toughest Tunnels (S07E02)
Photo © Discovery Networks
![Impossible Engineering - Season 7 - World's Toughest Tunnels - Photos](http://image.pmgstatic.com/cache/resized/w663/files/images/film/photos/168/722/168722135_7dmney.jpg)
World's Toughest Tunnels (S07E02)
Photo © Discovery Networks
![Impossible Engineering - Season 7 - World's Toughest Tunnels - Photos](http://image.pmgstatic.com/cache/resized/w663/files/images/film/photos/168/722/168722138_rj918p.jpg)
World's Toughest Tunnels (S07E02)
Photo © Discovery Networks
![Impossible Engineering - Season 7 - World's Toughest Tunnels - Photos](http://image.pmgstatic.com/cache/resized/w663/files/images/film/photos/168/722/168722139_pvloaq.jpg)
NYC Mega Tower (S07E04)
Photo © Discovery Networks
![Impossible Engineering - Season 7 - NYC Mega Tower - Photos](http://image.pmgstatic.com/cache/resized/w663/files/images/film/photos/168/978/168978573_8hlstq.jpg)
NYC Mega Tower (S07E04)
Photo © Discovery Networks
![Impossible Engineering - Season 7 - NYC Mega Tower - Photos](http://image.pmgstatic.com/cache/resized/w663/files/images/film/photos/168/978/168978574_spzcyd.jpg)
NYC Mega Tower (S07E04)
Photo © Discovery Networks
![Impossible Engineering - Season 7 - NYC Mega Tower - Photos](http://image.pmgstatic.com/cache/resized/w663/files/images/film/photos/168/978/168978575_3flmo9.jpg)