The prison was filled with noise and bustle, but Feng Xue incessantly dug his way to survival. As the passage behind him slowly filled with rubble and soil, Feng Xue could barely hear the sounds of the outside world; only the vibrations from the ground informed him that the chaos within the prison walls had not yet subsided.
The narrow passage was not spacious and only just wide enough for Feng Xue to move forward. It was fortunate that as an Identity, he no longer needed to breathe, otherwise with such a method of digging, he would have suffocated before reaching the sewer.
Typically, such dark and confined spaces could easily invoke claustrophobia, and even with easy breaths, a normal person would feel intense oppression and discomfort after just ten minutes.
Feng Xue was able to endure not because his spirit was particularly tenacious, but because he held the spoon from Shawshank.