From Halopedia, the Halo wiki
Entombed is a simulation of a hypothetical UNSC base on an asteroid close to Installation 04 before its destruction. The power weapons featured on the map are the M41 SPNKR rocket launcher and the Z-750 binary rifle. Other weapons and equipment include the Hydra MLRS, the M395 DMR, the Z-110 Boltshot, the Z-250 lightrifle, and the overshield. There are also M12B Warthogs, M290-M Gungooses, and a Type-58 Wraith.