Scary video of an abandoned mine!

From the video, we understand that a guy has ventured into an abandoned mine to film the interior of the mine but after a few seconds of being inside the mine shaft, he begins to hear strange noises.

At first, he wonders, "It is the wind?". But after a few more seconds of listening, he clearly hears weird and scary sounds and whispers that start and stop --- that make his skin crawl! 

What happened is so strange that it forces him to rush back to the portal to get out of the mine shaft . . . Immediately!