Extra credits:-
Play the Deep Scan game. A credit will be earned every two submarines
destroyed. These credits will be transferred to the Dynamite Deka game.
Extra Deep Scan submarines:-
Highlight the "Start" option for Deep Scan, hold X + Y + Z, then press
Start.
Fast Deep Scan submarines:-
Highlight the "Start" option for Deep Scan, hold X + Y + Z + B then press
Start.