Quem são essas pessoas?
Eles são prisioneiros. O poço é uma prisão:
The Pit is a prison located in the ancient part of the world, which had established such a fearsome reputation that it became referred to as "the worst Hell on Earth".
Por que o Al Ghul do Bane / Talia / Ra (antes de morrer) / Batman ajuda a libertá-los?
Bane, Talia e Ra's Al Ghul:
Como eles poderiam libertá-los, os prisioneiros foram os que mataram a esposa de Ra's Al Ghul (mãe de Talia) e Bane desfigurado:Approximately 30 years before the events of The Dark Knight Rises, a young mercenary was sentenced to be imprisoned within this Pit for falling in love with the daughter of the warlord he worked for. Unbeknownst to the mercenary, however, the warlord's daughter arranged for his release under the condition that she take his place in The Pit. Also unknown to him was that she was pregnant with the mercenary's child and she gave birth inside the prison walls. She named their daughter Talia. Many years later, the warlord's daughter was attacked and killed by the other inmates. Talia, however, was protected by a fellow prisoner known as Bane, a man who spent his entire life in the prison.
Bane later aided in Talia's escape from the prison, which lead to his disfigurement through severe beatings. Bane was then treated by the prison doctor and heavily bandaged. Following Talia's escape from the prison, she located her former mercenary father, Ra's al Ghul, and he returned with the League of Shadows to exact revenge upon the prisoners who had killed the love of his life.
Que melhor vingança do que mantê-los lá?
Batman / Bruce Wayne:
Bruce Wayne ajudou-os: Depois que ele saiu com sucesso, ele jogou uma corda para que os outros prisioneiros pudessem escalá-la e se libertar.
Como as pessoas lá embaixo conseguem comida e água?
Leia isto pergunta scifi.stackexchange.com .
Nota: Todas as citações são tiradas de Batman Wikia # The Pit .