The Olympia is a shotgun in every Zombies map of Call of Duty: Black Ops.
It is similar to the Double-Barreled Shotgun from Call of Duty: World at War, being a shotgun with two shots in it. It can be found in the first room of all Black Ops zombies maps, and can be purchased for 500 points. Like the M14, the Olympia loses its effectiveness after about round 5.
After Pack-a-Punching, the Olympia becomes "Hades," and obtains much higher fire-power. It also contains incendiary rounds, having the ability to set zombies on fire when shot.