Spear Gun

The Spear Gun is a recurring weapon in the Tomb Raider series. It appears in games that have multiple aquatic levels.

Original Timeline
Tomb Raider II - Tomb Raider III

The Spear Gun appears as the Harpoon Gun in both Tomb Raider II and Tomb Raider III. While being the weakest weapon, it is the only gun that Lara can use underwater. Considering it's very low damage and the limited air supply while underwater, it is usually best to just avoid the enemies. There is plentiful ammo for it but it is recommended to just leave it in the inventory and, if possible, rather kill the enemies from the surface.

Firepower: 2/10

Firing rate: Average, but after four shots it has to be reloaded.

Tomb Raider Underworld
The Spear Gun returns for the first time since Tomb Raider III. It is more powerful and reloads faster, using a pump action unlike the previous spear guns in the series.

However, Lara's Pistols and Mjolnir can both be used underwater, which are far more viable options, since they can shoot faster and are more powerful respectively. as well as having unlimited ammunition.

Trivia

 * After beating the game once on both games and unlocking infinite ammo, the Harpoon Gun will change to an even smaller clip size of only one shot, making the weapon even more useless.