Take a Flying Tour of London’s New Crossrail Tunnels

Since 2012, more than 10,000 construction workers have been laboring underground to finish London’s ambitious Crossrail project, and now we can get a sneak peek.

The Crossrail won’t open until 2018, but workers recently finished the digging the 13-mile underground portions of the Crossrail. And thanks to a BBC aerial photographer, we can tour the Crossrail’s freshly laid tunnel system, which is still closed to the public.

It may surprise people to see just how cavernous this un

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