If this 泡 looks like a bathysphere, that's what it is, but there are some counterintuitive topologies at work here. Actually we, and the rest of our 世界, are inside it... though the 球表面 seems to enclose something inside it, actually that apparently tiny 球表面 covers and protects our entire 世界 from the terrible pressures of the much larger 雰囲気 and worlds that lie behind it. The scientists who made it knew this.
