Is is unique as it can be used underwater and above water. Technically, it is not a harpoon gun, but a spear gun. The spear of a spear gun can be propelled through elastic power, pneumatics or an explosive charge.
It's best used only when in the water, against sharks, barracudas and divers. It's generally not that effective. If possible it's better if you climb out of the water and use the pistols. Although the Harpoon launcher can be more effective in a few circumstances. The Hydro Propeller uses the same ammo.
The harpoons Lara collects and fires in TR2 and TR3 are more powerful than the ones shot at her by divers, but their guns can fire continuously, while Lara must reload after every four shots. The weapon is totally useless out of the water, and only marginally useful as the only underwater weapon in the games.
Tomb Raider II
First Found: Offshore Rig
The Golden Mask
First Found: The Cold War
Tomb Raider III
The Lost Artifact
First Found: Highland Fling
Tomb Raider Underworld
In Tomb Raider Underworld the Spear Gun is available throughout the entire game via the weapons selection menu.
Harpoon Gun in Tomb Raider II
- ↑ Description in the in-game PDA