The Rocket Propelled Grenade, (or RPG), is a large weapon used by the armored assassin to kill Frank. The RPG can also be found on the top of the parking deck at the start of the prologue, only when Jake fails his mission.
- The RPG currently cannot be obtained without failing the mission on the first map of the Prologue.
- The iron sights, based on how they were positioned on the weapon, is realistically impossible to be used in conjunction with the launcher itself. In order to be used effectively, it has to be mounted on the side of the weapon, not above.
- In Chapter 1's release, the RPG gained a laser sight
- The complete name of the gun is "Ruchnoi Protivotankoviy Granatomjot - 7", means "Hand Anti Tank Rocket Launcher - 7" (RPG-7). It is a Russian-made rocket launcher which can be found in many places of the world. The RPG7 seen in Underhell has been modified , with a green finish (the real weapon have an orange and black finish) , iron sights mounted to the gun's above, with an scope, and laser sight .