Chrome tries to use his knowledge of science to escape from his prison, but he just doesn’t have the tools. Yo, a former cop who had been revived into Tsukasa’s army, tries to work up the ranks.
The walls and ground are 
too hard to dig through.
.الجدران والأرض أصلب من أن أحفرها
Wände und Boden sind zu hart,
da komm ich nicht durch.
No puedo excavar ni la pared ni el piso.
Y no hay forma de hacer un agujero.
Les parois sont trop dures
pour creuser.
Non posso scavare le pareti o il pavimento
 perché sono troppo duri...
As paredes e o solo são 
duros demais para cavar.
Стены и пол слишком твёрдые, чтобы рыть.