This goes way back, for me. A long, long time ago, I was trying to write a sci-fi story, where the Earth was being consumed by this thing called the Black Tide. Humanity was going to escape the planet using Ark ships, gigantic self-sustaining ships that went off into space and... Well, I have no idea what was going to happen then. I stopped writing it there because I had no plan and I'm no good at sci-fi. 