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In Operation Cloud Lab a group of scientists fly from coast to coast across the U.S. in one of the world's largest airships to shed light on the mysteries of the atmosphere.

The Cloud Lab team in front of their airship.  Photograph: BBC

Find out more about the show on BBC's website:

You can also watch new episodes on BBC's iPlayer: here.

Watch the Cloud Lab team explore clouds from within by use of an airship in the first episode below.

The Cloud Lab crew continues the journey in their airship on the second episode below.


Photographs: BBC