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Hercules and the Kerberos (or Cerberus, the offspring of Typhon and Echidna ). The monster with the three heads was protecting the entrance of Hades. It is not clear why he kept the living from entering the world of dead because I cannot assume that there was any interest to visit Hades.

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Cerberus of the three mouths is probably nothing more than the triple echo of the sounds of cave-dwellers calling out to each other in the infernal darkness. Lacking physical understanding of sound waves, reflection and echoes, ancient men would naturally infer a real agent, so that a muted, echoing roar would be taken as the sound of the Dog of Hell. William Harris Greek Myth

But Plutarch says:

WHETHER THE VOICE IS INCORPOREAL. WHAT IS IT THAT THE GIVES ECHO?

Pythagoras, Plato, and Aristotle declare that the voice is incorporeal; for it is not the air that causes the voice, but the figure which compasseth the air and its superficies having received a stroke, give the voice. But every superficies of itself is incorporeal. It is true that it move with the body but itself it hath no body; as we observe in a staff that is bended, the matter only admits of an inflection, while the superficies doth not. According to the Stoics a voice is corporeal since everything that is an agent or operates is a body; a voice acts and operates, for we hear it and are sensible of it; for it falls and makes an impression on the ear, as a seal of a ring gives its similitude upon the wax. Besides, everything that creates a delight or injury is a body; harmonious music affects with delight, but discord is tiresome. And everything that moved is a body; and the voice moves, and having its illapse upon smooth places is reflected, as when a ball is cast against a wall it rebounds. A voice spoken in the Egyptian pyramids is so broken, that it gives four or five echoes.

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