I've been down many dark holes and tunnels in my life - I'm a rabbit - but none of them have been like this. Usually my burrows are cosy and smell of healthy, loamy soil. Yes, they are usually dark but they're small and familiar - and even when they're not my own, my nose guides me and I find my way through all the forks and chambers.

This place is different. My nose cringes at the choking, acrid air, unable to guide me, and the darkness is thicker somehow. I've wandered around for days, a little diffident but unintimidated... And at last, an orange glow in the distance! I've come to a chamber with a glowing portal, through which I see another world. I don't recognise it, and I suspect it will be a long time before I recognise anything in this adventure... But it has what looks like a sky, and mountains! Are you ready to get out of this dust and darkness, dear companions?