First you need to have the cheat infinit life (square L2 L1 triangle(2) L2) then you go to the level lights out in port city go to the german U ship and blow it up. But stay on it you will not die and when it sinks you will still be walking on water.warning will have to restart.
Unlock Cheat Mode During gameplay pause the game and hold L1 + R1 and press Circle(2), Left, Triangle, Circle, X. If the code has been entered correctly 'Enter Cheat' will appear on the screen. Release L1 + R1 and enter the following codes to activate the corresponding effects. Enter the code again to disable it's effect.
First you have to press the START button, then hold L1+R1, then press Circle, Circle, Left, Triangle, Circle, and X, then you'll see something on the left side corner, it'll say "Put Cheats" or something else. Then press these buttons for the cheats: Fill up Adreline to 100%: L1, R2, R1, Up, Triangle, Circle God Mode: Square, L2, L1, Triangle, Triangle, L2 Infinite Ammo: L1, L1, Square, L2, L1, R1