Secrets of the Underground
Returning Series – episode 2x3 aired 5 days ago, episode 2x4 airs in 1 day
23: Tesla's Final Secrets(November 11, 2017 – 5 days ago)
Nikola Tesla died before he finished a mysterious invention, but the ground beneath his only remaining lab might hold clues; Rob Nelson and Stefan Burns are the first to use cutting-edge tech to investigate Tesla's underground secrets.