Doctor Who: 15 Cool Details Peter Harness Just Revealed About The Zygon Invasion

9. The Tunnels From Flatline Were Reused Due To Budget Limitations

Doctor Who The Zygon Invasion Clara Flatline tunnel
BBC/Twitter: @mrpeterharness

Twenty minutes into The Zygon Invasion, Clara rides a lift and finds herself in a massive, sparsely-lit tunnel, which leads to an area packed with Zygon pods.

This tunnel is the same one that was used in Flatline, an episode from Capaldi's first series as the Doctor. Harness' original idea was for the Zygons to inhabit abandoned Tube stations, but this notion was scrapped due to budget limitations.

Harness also stated that the idea of using a lift to reach the tunnel was thought up by script editor David Davis. Team effort!

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Danny has been with WhatCulture for almost nine years, and is currently Doctor Who Editor and WhoCulture Channel Manager, overseeing all of WhatCulture's Whoniverse coverage. He has been writing and video editing for 10+ years, and first got a taste for content creation after making his own Doctor Who trailers and uploading them to YouTube (they're admittedly a bit rusty by today's standards). If you need someone to recite every Doctor Who episode in order or to tell you about the making of 1988's Remembrance of the Daleks, Danny is the person to ask.