I assume you're getting your butt kicked by the Russian Alpha sub, not the surface destroyer. I know, been there...took me three weeks. But, there's no need to hack the game. Is it possible? Probably, but why? General steadfast rule among adventure games: go everywhere, do everything. If that doesn't help you, I'll give you a solution (not the only one):
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Dive down quickly. You'll hit an inversion layer. Keep going until you hit bottom. Remember the depth and restore (I'd tell you, but I forget...I think it's around 1800, but you'll probably crash.) Do it again, only this time, don't crash. Then, zig zag. The Alpha will lose you due to the disturbances of the rocks and leave. You win by default. There may be a way to win in sea combat, but I never could.