What is permafrost?

Sky's Diana Magnay explains from deep inside a permafrost cave in the Russia's Arctic Circle.

SUBSCRIBE to our YouTube channel for more videos:    / skynews  

Follow us on Twitter:   / skynews  

Like us on Facebook:   / skynews  

Follow us on Instagram:   / skynews  

For more content go to http://news.sky.com and download our apps:

Apple: https://itunes.apple.com/gb/app/sky-n...

Android https://play.google.com/store/apps/de...

Sky News videos are now available in Spanish here/Los video de Sky News están disponibles en español aquí https://www.youtube.com/channel/skyne...