From Halopedia, the Halo wiki
Habitat Pineapple was an area of the Rubble controlled by the Kig-Yar. It contained what seems to be a prison. In the Battle of the Rubble in 2535, after the Retribution's Thunder was destroyed, the surviving Sangheili were brought here and locked up. Thel 'Vadamee noted that the habitat was crudely constructed.