Critical Depth

Back in 1997, Singletrac, the developers of Twisted Metal, produced another Vehicular Combat game under GT Interactive for the PlayStation. Its main difference was that the players would battle in various undersea battlegrounds with a variety of dangerous and bizarre submarines. There was also more Backstory given to flesh out its many combatants and factions.

The plot involves a series of mysterious pods appearing in oceans across the world, which attracts a number of treasure hunters, governments and organizations to try and discover their purpose and use them for their various desires. Each level contains five pods which all must be collected to activate a Threshold that leads to the next level.

Fighting for the pods and threshold are:
 * The C.I.A., who believe the pods to be of extraterrisial origin and intend to keep anyone else from discovering its secret. Pilots the Manta
 * The Soviet Die Hards, a trio of former Soviet military and government leaders attempting to resurrect the Soviet Union. Pilots the Stalingrad,
 * The French Oceanographers, who believe that the pods are living creatures and intend to finally get some respect from their peers. Pilots the La Griffe.
 * Dr. A. Pocalypse, Mad Scientist who wishes to wipe out the rest of humanity and repopulate it with a more superior race. Pilots the Armageddon.
 * The Order of Nishroch, a Cult believing the pods to be a sign of the Apocalypse from their god Zonrad. Pilots the Ohm.
 * Team Earth Hope, a pair of enviromentalists intending to kill anyone attempting to take what they believe are natural wonders. Pilots the Siren's Song.
 * Captain Cutlass, disgruntled former childrens-show host turned full-blown Pirate. Pilots the Sea Dog.
 * The Mordrid Corporation., run by Corrupt Corporate Executive Dana Nadel who intends to use the pods for an alternative energy source or whatever for profits. Pilots the Bottom Liner.
 * The Venganza Liberation Organization, a group determined to end oppression and explotation of Venganza. Pilots the Anarchy.
 * Joe Skullion, a Surfer Dude who's there for thrills and finding spiritual peace. Pilots the Death Sled.
 * Professor Armstrong, Adventurer Archaeologist who believes the pods to come from an ancient race. Pilots the Archimedes.
 * Jack Lock Jaw' Keon, Prof. Armstrong's protégé-turned-rival, aiming to add the pods to his private collection. Pilots the Lockjaw.
 * Mr. Phatt, arms-dealer and . Pilots the Krono.
 * Pilots the Barracuda.
 * Pilots the Razor Fin.
 * Pilots the Hydro Spydor.

This game also contains examples of:
 * Aliens Steal Cattle: The C.I.A. provide an alien race with fresh bovine placentas in return for their staying under wraps.
 * Arrows on Fire: Yes, they do work underwater. And with homing capabilities, to boot.
 * As You Know
 * Bag of Spilling: The game won't let you use old pods in new areas.
 * Captain's Log
 * Combos
 * Cyanide Pill: The C.I.A. refers to them as "Patriot Pills".
 * Die, Chair, Die!
 * Disc One Final Boss, but not in the way you might think:
 * Gotta Catch Them All
 * The Men in Black: (The C.I.A.
 * Mission Briefing
 * Multi-Armed and Dangerous
 * Multiple Endings
 * News Travels Fast
 * No Fair Cheating: No points or unlockables are given with cheats.
 * Pacifist Run: It is not necessary to destroy the other subs; just grab the pods and leave. Death Match mode, however, just focuses on killing everyone.
 * Power-Up (the pods)
 * Prophetic Names (Dr. Adam Pocalypse and mate Evelyn)
 * Sapient Cetaceans:
 * Stripperiffic: Evelyn appears in only a lab coat and jeans.
 * The Chosen One
 * The Juggernaut (the Soviet Die Hards' Stalingard sub and, later, Mr. Phatt's Kronos)
 * Threshold Guardians
 * Video Game Cruelty Potential: Blowing up various aquatic lifeforms. Even more ironic when using Team Earth Hope to do it.
 * Worthy Opponent: Joe gets bored with the opponents in early levels, then Mr. Phatt comes along.