"I could have used my gun, of course, but I found this, and I thought, "How apt! Small fish out of his/their depth!""
―Viktor commenting on the harpoon gun
The Harpoon Gun is an unobtainable gun used by Viktor Skobel during the opening scene of The Fall of an Icon. It is known to kill with a single shot. What he does with the gun is based on Eddie's choice during the mission Return to the Scene of the Crime.

In two of the game's possible endings, in which Eddie helps Sam, Viktor will point the gun at Eddie after Eddie throws Alexei off the end of the boat. Viktor confronts Eddie and Sam will disable the boat's engine, causing the driver to lose control and not be able to turn the boat. During the confusion, Eddie attacks Viktor and punches him in the face, causing Viktor to drop the gun. Viktor will retrieve it moments later and swing it at Eddie, trying to hit him. Eddie dodges both attacks and then punches Viktor in the stomach, causing him to drop the gun. The fight then continues at the front of the boat before the boat crashes.

In the other two possible endings, in which Eddie leaves Sam, Viktor will hold Sam hostage with the harpoon gun and threaten to kill her. As Eddie moves up to confront Viktor, he drops Sam's body and points the gun at Eddie. After Viktor reveals to Eddie that he wants to use him as a scapegoat, Eddie makes his move and attacks Viktor. The gun then accidently goes off and hits the boat driver, going straight through his stomach and killing him instantly. Because of this, no one is able to operate the boat, causing it to lose control and crash. During the fight between Eddie and Viktor, Viktor will also pick up the gun and try and swing it at Eddie, but will miss both times and then be punched by Eddie in the stomach. Viktor then drops the gun again and the fight continues at the front of the boat as it does with the other two endings.

On both occasions, the harpoon gun is lost afterwards and Viktor resorts to dual Desert Eagles once inside the Pumphouse.

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