What is the cheat code for Hydra in GTA San?

Excuse me, could you possibly clarify something for me? I've been hearing about this so-called "cheat code" for Hydra in GTA San Andreas, and I'm just wondering if you might have any insight into what it is or how it works. I'm not too familiar with the intricacies of the game's cheats and was hoping you could shed some light on this particular one. I'm really curious to know if it's something that actually exists and, if so, what kind of effects it has in the game.