So I recently learned about this place that exists, that would basically be my personal hell on earth. In Borneo, there's a cave called "Deer Cave" that, from most of the photos, looks like a typical beautiful cave in a lovely tropic region. But, their ecosystem is all based on the bats that live at the roof of the cave, and the guano (bat shit) that falls to the floor of the cave and piles up in huge mountains. And guess what eats the guano? Cockroaches. Huge ones, like 2-3 inches long, and they literally live in a swarming CARPET that goes down to the deepest levels of the guano. Millions and billions of them. They even eat the dead and still-alive dying bats that occasionally fall from the ceiling. There are youtube videos of it....from afar, it looks like the ground is full of pebbles, but then they're moving, and then the camera zooms up close and you see that they aren't that tiny after all, and you see what they really are. Youtube it. I dare you. Can you imagine that for a novel? Like, what if a serial killer's MO was to tie up/drug their victims, then haul them into that cave and leave them there? (That would be similar to a certain Dean Koontz book, not to give spoilers to anyone who doesn't know which one) Or what if a tyrannical government disposed of criminals that way - instead of prison, you get solitary confinement in Roach Land, and have to also eat them as a food source? Seriously, that idea doesn't fit into any of my novels, so if you need something gruesome for your crime fic than totally use it. Gross!!!