Is there a Hydra in Fort Zancudo?

Could you elaborate on whether or not there exists a mythical creature known as a Hydra within the confines of the heavily fortified military base, Fort Zancudo? The idea of such a creature lurking amidst the military installations and aircraft carriers intrigues me greatly, and I'm curious if there's any truth to the rumors surrounding its potential presence. Is it simply a product of wild imagination, or could there be some hidden truth that we're yet to uncover?