Kohaku has located the treasure left behind by Byakuya and the others, but it's encased in concrete. Senku has to devise a plan to quietly get at the contents inside, so as to not alert the guards.
Then why...
...لماذا إذًا
Wieso tust du das dann, Byakuya?
¿Y por qué te esfuerzas tanto?
¿Y por qué te esfuerzas tanto?
Byakuya, alors pourquoi…
E allora perché ti impegni tanto, Byakuya?
Então, por quê?
Тогда зачем, Бъякуя?