Nice Glitch!
Use The Flying Car Cheat... Don't Have it with me right now sorry, but search for it and use it.
Now, while flying, fly straight down right into the sea, if your health starts decreasing use the health cheat : R1 R2 L1 X (Left Down Right Up) X2
Your screen should go black and then... Your in the city... =0
If you need more help, we've got more Grand Theft Auto: San Andreas cheats and also check out all of the answers for this game
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