Critical Depth

Critical Depth is a 1997 vehicular combat game developed by SingleTrac and published by GT Interactive for the PlayStation. It was released on November 21, 1997. Critical Depth is based on the concept and engine of SingleTrac's original best selling Twisted Metal franchise (a demolition derby which permits the usage of ballistic projectiles), but occurs under water. All vehicles in the game are submarines. Players choose a sub and an arena in single mode to engage in fights with opposing sailors. A variety of weapons and upgrades are obtainable by pick-ups scattered throughout the stage as well as each sub having their own exclusive "special weapon".