They're... weird. Random. Usually we get one or two a month - floods, I mean. I've like, traded places with my girlfriend and been a five year old kid - twice - and then sometimes we stop in weird places for port, which can be like, anything. If you've got superpowers, sometimes you won't have them while you're down there. And then breaches are like, you think you've been living a whole other life in an alternate universe the whole time.