On G+ somebody asked about an underwater campaign setting I was supposedly writing, called "Unit Swim" or "Union Swim" or something. This tickled me tremendously, but it also gives me the opportunity to talk about Behind Gently Smiling Jaws a bit - which I haven't done in a while.
One of the rules I made myself promise I would follow, pretty early on, is that nothing in BGSJ would come from or be based on other existing works of fantasy. It all had to be either completely novel or based off real world history or legend. This has worked well in large part, but has created a real sticking point in one area of the world map - the Underwater Ziggurats. These are remnants of alien cities on the sea floor which the crocodile supposedly saw in some lost era, akin to Atlantis - the conceit being that aliens did actually colonise the ocean bottom millions of years ago and the crocodile was witness to this. It's based on the Yonaguni Monument/Formation.
So far so good, but it turns out it is really difficult not to turn this area of the campaign setting into Deep Ones and Cthulhu and Father Dagon. Coming up with a concept of aliens living in underwater cities which owes nothing to Lovecraft is hard. His work is practically the first and last word on the subject.
I'm working on it.
Another stumbling block is more practical: format. I know that producing an eight-volume slip case is a really bad idea. A really, really bad idea. A really, really, really bad idea. But sometimes bad ideas sound very good - like that decision to eat a Double Decker after lunch, or that decision to miss the last train home on a night out, or that decision to have a cigarette when you know you shouldn't.... The multi-volume slip case idea just will not relinquish its hold.