• Quadruple Damage

    Enter the following codes during gameplay (controls must be in default setting):

    Depth ChargesHold R2 and press Left, Right, Up
    Drop PodsL1, R1, L1, R1, Up, Down, Up, Up
    Guided MissilesHold Triangle and press R1 + L1. Move the missles with the D-Pad and press R1 + L1 to detonate.
    Infinite weaponsL1, R1, L1, R1, Up, Down, Left, Down
    InvincibilityL1, R1, L1, R1, Up, Down, Left, Right
    Lay a MineHold R2 and press Right, Left, Down
    Quadruple DamageR1, R2, R1, R2, Up, Down, Up, Down
    Stun BlastsHold R2 and press Right, Left, Up
    Surface MinesHold R2 and press Left, Right, Down


  • Unlockable Submarines

    UnlockableHow to Unlock
    Abbadon SubmarineComplete the game as Agent 326 on the Captain difficulty setting
    Agent 326 SubmarineComplete the game as Mr. Phatt on the Captain difficulty setting, then defeat the Cephalopods with a final score of at least 1,000,000 points.
    Mr. Phatt SubmarineComplete the game on the medium difficulty setting, then defeat Mr. Phatt with a combo attack of at least 48 points of damage.
    Overseer SubmarineComplete the game with each of the original characters on the Captian difficulty setting (save each game after it is completed).

    Contributed By: CDBavg400.

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