Videos of playlist "PL39_ud5aKSvkXp7Vc_mGXElSTzZj_3iHv"
2:28 / The Perils of Searching for Sunken Treasure
1:36 / This Underwater Camera Hunts For Missing Gold
2:39 / Searching For Booze Smuggling Tunnels Beneath The Detroit River
1:54 / Exploring What Lies Beneath Nikola Tesla's Lab | Secrets of the Underground
1:29 / How To Find Long Lost Treasure Under An Ancient Church | Secrets of the Underground
1:40 / See Rob Nelson's Favorite Location from Secrets of the Underground
3:11 / This California Supervolcano Has Geologists Wondering: Is It Waking Up?
2:08 / See How Scientists Use Underwater Scanning Technology To Find Hidden Details
3:14 / See How Scientists Create Mini Earthquakes in a Laboratory
3:20 / We've Unlocked The Secret Of The Legendary Thor's Well
1:35 / What Is The Meaning Of This Underwater Stonehenge?
2:55 / This Treasure Trove of Ice Age Fossils Came From One Texas Cave
1:38 / How Do Paleontologists Date Fossils? | Secrets of the Underground
0:54 / Where Did Pi Come From? Happy #PiDay! | Secrets of the Underground
3:00 / Dinosaurs Left Evidence Of Their Mating Ritual In Colorado | Secrets of the Underground
3:16 / What Really Happened To These Railroad Workers Found In A Mass Grave?
3:21 / What is the Meaning of Ohio's Mysterious Serpent Mound? | Secrets of the Underground
3:14 / These High Tech Tools Help Locate Secret Tunnels | Secrets of the Underground
3:19 / These Hidden Tunnels And Stairways Helped Al Capone Evade Arrest
1:10 / Secrets of the Underground | NEW SERIES | Premieres Tue Feb 14
