Pen tells Prog: "It's so easy to slip into the darkness in the modern world. It's like Alice In Wonderland, where you're falling into the rabbit hole and it's all spiralling out of control - but all you want to do is go home and be safe."

He was partly inspired by reading about explorers in isolation. "I started just thinking about how we can go slightly crazy if we push ourselves to do things," he says. "Everybody seems to want to break free in their own way. Creating that atmosphere in the album was something I really enjoyed."