Since long ago, each pack has had two kinds of prisons. The first was the lower ground prison to lock up rogue werewolves or humans who sneak into the pack with malicious intent.
The second was a prison further below that had a restraining spell. This cell was for confining vampires, or elves and fae who come in to spy on them. This indicated that the prisoners in this second dungeon had magic or gifts that could kill an ordinary werewolf.
In other words, this particular prisoner was a dangerous creature and should not be released without the permission of the Alpha. Besides, no one had the right to beg for forgiveness for the prisoners, let alone free them secretly.
Apart from Alpha and his two right-hand men, no one knows who and what creatures are being locked up in this second prison. But Letti found out and freed them just like that.
