Critical Depth - More codes


Invincibility:
Press L1, R1, L1, R1, Up, Down, Left, Right during game play. 

Unlimited weapons:
Press L1, R1, L1, R1, Up, Down, Left, Down during game play. 

Drop pod:
Press L1, R1, L1, R1, Up, Down, Left, Up during game play to force opponents to 
drop their pods. 

Quadruple weapon damage:
Press R1, R2, R1, R2, Up, Down, Up, Down during game play. 

Stun blast:
Hold R2 and press Right, Left, Up. Note: This assumes the controller is in the 
default configuration. 
Information in this section was contributed by Joel Curtis. 

Depth charge:
Hold R2 and press Left, Right, Up. Note: This assumes the controller is in the 
default configuration. 
Information in this section was contributed by Joel Curtis. 

Lay a mine:
Hold R2 and press Right, Left, Down. Note: This assumes the controller is in the 
default configuration. 
Information in this section was contributed by Joel Curtis. 

Surface mine:
Hold R2 and press Left, Right, Down. Note: This assumes the controller is in the 
default configuration. 
Information in this section was contributed by Joel Curtis. 

Mr. Phatt submarine:
Complete the game under the medium difficulty level. Defeat Mr. Phatt using a 
combo attack that results in a minimum of 48 points of damage. 

Agent 326 submarine:
Complete the game as Mr. Phatt under the "Captain" difficulty level. Defeat the 
Cephalopods (Bosses) with a final score over 1 million points. 

Abbadon submarine:
Complete the game as Agent 326 under the "Captain" difficulty level. 

Overseer submarine:
Complete the game with each of the regular characters under the "Captain" 
difficulty level. Note: Save the game each time the game is completed. 

 
Codes from Video Game Strategies (http://vgstrategies.miningco.com)