To beat the shark sub, kill all the enemies that come out. Then hold L1 to aim and shoot out the turrets on the sub to sink it.
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GameShark Codes
Infinite Lives
800eddec0063
Extra Lives
d005c098 ffff
8005c098 0001
Infinite Health
d005bf94 6fed
8005bf9a 2400
d005c604 718a
8006c60a 2400
Max Weapon
300ee110 003
Max Grenade
300ee111 0003
Max Head Looking Thing?
300ee114 0006
Press R2 For Full Bio-Strike
d010b502fdff
800ee1140106
Unlock All Levels
800edb4e0001
High Score
800edde215e7
800edde605f5