Why "Down Bubble?" What does it mean? Well, it's a term having to do with the angle a submarine dives at... the same way a builder might use a bubble level to make sure a foundation is level, submarines (at least the old ones) use a bubble level to measure the angle of their dive. I liked the nautical ring it has to it, especially because most of my designs were based off an image of an octopus. I might change the name in the future, but so far nothing has surfaced... see what I did there?