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.
It was around noon that I set 
the bomb. It should be ready.
.وضعت القنبلة مع الزوال. ينبغي أن تكون جاهزة
Ich habe es am Mittag reingetan.
Ist es so weit?
Ça ne devrait plus tarder,
ça agit depuis ce midi.
Le ho inserite in mattinata, 
quindi dovremmo esserci quasi.
Era por volta de meio-dia quando 
coloquei a bomba, deve estar pronto.
Я заложила бомбу днём. Уже пора.