This aqua-rifle is accurate and powerful, firing hollow steel harpoons from sealed packs of 10. Each harpoon has its own gas reservoir.
Source: Terror From The Deep Ufopaedia
The Jet Harpoon fires a high pressure jet propelled armour piercing harpoon. Like the harpoons used by divers for hunting dangerous sea creatures, the Jet Harpoon has been adapted as X-COM's initial standard underwater rifle. They can be fired in any environment with no loss in power or accuracy.
Like the Dart Gun, the Jet Harpoon is not an especially powerful weapon. It does have twice as much power and is faster and easier to aim than the Dart Gun. It is enhanced with the addition of a three round burst mode.
One of the Jet Harpoon's weaker points is its low ammunition capacity. It only has 10 harpoons. This requires carrying plenty of spare harpoon clips for long sorties.
Jet Harpoons are functional in the early game and effective against the Aquatoids or Gillmen that you meet. The low damage of the Jet Harpoons do not allow them to stay competitive for long and will not hurt the Lobstermen or many of the stronger terror units.
Initially compliment them with heavier firepower such as grenades and the Gas Cannon. Replace them at the earliest opportunity once Gauss and Sonic weapons are available.
Take care when using auto shots as the clips only retain 10 rounds.
|Terror From The Deep: Equipment (TFTD)|
|Armor||Diving Suit • Plastic Aqua Armor • Ion Armor • Magnetic Ion Armor|
|Weapons|| Dart Gun • Jet Harpoon • Gas Cannon • Hydro-Jet Cannon • Torpedo Launcher • Thermal Tazer|
Magna-Blast Grenade • Particle Disturbance Grenade • Magna-Pack Explosive
|Portable Equipment||Dye Grenade • Particle Disturbance Sensor • Medi-Kit • Chemical-flare • M.C. Disruptor • M.C. Reader • Zrbite|
|SWS||Coelacanth/G. Cannon • Coelacanth/Aqua Jet • Coelacanth/Gauss • Displacer/Sonic • Displacer/PWT|
|Data||Weapon Summaries • TFTD Item destruction table • SWS/Terror Unit Innate Weapons|