Chapter 52: Methods to Avoid Bugs_1
The underground fissures in the Earth's Scar, rather than being a mere cave, were comparable to a massive world hidden underground. Even if we only considered the first eight layers that had been mostly explored by enthusiastic explorers, the total area covered was almost a quarter of the Yarran Continent's surface area. And that was merely half, or perhaps even a third, of the entire Underground World. If Ike's supposition was correct, that each subsequent layer of the Underground World was larger than the last, then the combined area of all seventeen or even twenty-one layers exceeded the surface area of the Yarran Continent itself.