Why are they joyful that Buna is being bombed?

The characters express joy over the bombing of Buna because it represents a potential end to their suffering and oppression under the brutal conditions of the concentration camp. The destruction of the camp symbolizes hope for liberation and a chance to escape the horrors they have endured. Additionally, the chaos and disruption caused by the bombing ignites a sense of rebellion and possibility among the prisoners, contrasting sharply with their otherwise bleak existence.