Submarine Commander Cheats

When you've come as far as Part3 - 7 Fights, go to collect your wanted Steel from the Dock Master, then go back and save. Here is the funny part: Get back to Dock Master, she will give you another 10.000 steels. Save again, go to Dock Master again, 10.000 Steels. Do this over and over again to get some serious steel.