Whatever conspiracy theories surround Sub-Layer Five they are child’s-play when compared to the nigh on hysteria the mere mention of the “DARK ZONE” creates amongst Marzians. This huge patch of land, many thousands of Urth miles across, is completely off limits to your average Marzian but even stranger, the same restrictions continue under ground. This creates, in effect, a global sized slice of cake that no one can enter or even enquire about. Rumour has it Professor Vimple is involved in whatever goes on there – but that cannot be verified because no one dares ask him.