As someone who has had some encounters with a voice no one else hears save yourself, I think you should not do anything and come away from there at once.

[ granted, it was not Genesis himself who had a voice calling him from an unknown source, but he had seen the results of such a thing. he watched as a man that he held in high regard - yes, he was irritated and sore about some things, but Sephiroth was still a man to admire - fell into the ravings of a madman before starting a path of genocide. that he didn't get far wasn't the point; Genesis did not trust voices inside the head or sudden urges. ]

We should look at the other doors, as Ib has suggested.