Illegally Inside #NewYorkCity #Subway Tunnel Filming ?

This man has guts to be inside the New York City subway tunnels having himself filmed and uploaded to his video channel on YouTube. He even admitted in the beginning of his video he doesn't have any permits or anything and doing this of his own free will. He goes deep inside NYC subway tunnels and is successful at what he worked to accomplish. Why did he do this?
http://bit.ly/1tphu55