After going through Storage Room B and getting on the deck, enter Triangle, Square, X, Triangle, X at the guard room door.
Game Shark Codes
Master Code (Must Be On) 0E3C7DF2 1853E59EEE841F36 BCD1A5F2
Infinite Armor DE87BB4A E0AB9B8DDE87BB52 680B9DA7
Infinite Ammo DE8A7206 BCA99B83
Shoot to Add Ammo DE8A7206 BCECABA4
Max Weapon Stats DE87748A E02B9BA3DE877496 6A4B9BAFDE876A3E 6A4B9BCB