Greenpeace activist Alex Harris on her time in Russian prison

A British Greenpeace activist has spoken exclusively to the BBC of her time in a Russian prison, following a protest at a Gazprom oil platform in the Russian Arctic.

Alex Harris, 27, from Exeter, was among 30 people arrested at the demonstration. She was released on bail but, along with the others, faces possible trial on charges of hooliganism.

She told the BBC's Daniel Sandford that tapping messages on pipes to people in neighbouring cells "kept us going."