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.
If only we had something 
like a silent bomb...
...ليتنا نملك شيئًا مثل قنبلة صامتة
Wenn wir nur eine
lautlose Bombe hätten.
Si seulement
on avait une bombe silencieuse…
Se solo avessimo qualcosa come le silent bomb!
Se tivéssemos algum tipo de
bomba silenciosa...