Even if an ordinary person possessed such brute strength, they could never sustain this level of endurance.

How long had they been working—from last night until now? Only ability users could last that long.

Ray observed them for a while and was able to calculate their breakthrough time almost precisely.

Three and a half hours.

As for where they would emerge, that was impossible to predict. The four of them had no real sense of direction underground, and their tunnel twisted and curved at ran