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.
No, but actually, there really is 
such a thing as a silent bomb.
.لا، هناك حقًّا قنبلة صامتة
Nein, ich mein’s ernst.
Beh, no, io intendo che esistono sul serio.
Não, mas realmente existe essa 
coisa de bomba silenciosa.
Нет же, она настоящая.
Бесшумные бомбы бывают.