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.
The big treasure Byakuya left behind.
.الكنز المطلق الذي تركه بياكويا
Den ultimativen Schatz, den Byakuya
und die anderen zurückgelassen haben.
le coffre aux trésors ultime
laissé par mon père !
Il tesoro definitivo
lasciato da Byakuya e compagni!
O tesouro supremo que Byakuya 
e os outros deixaram!
То самое великое сокровище,
которое оставил нам Бъякуя!