Secret passage in German WW2 tunnel found by drone. Where does it lead to ?

Secret passage in German WW2 tunnel found by drone. How is that possible and where does it lead to ? Part 2 here :    • Secret entrance found by drone in German W...   Part 3 here :    • Secret passage in a German WW2 tunnel clim...   Our unique videos takes a ton of time to create so If you like to support our work :   / ww2historyhunter   https://paypal.me/WW2HistoryHunter?lo... My Email : [email protected] Check out my monthly WW2 diorama giveaway videos in the beginning of each month. Beautiful WW2 dioramas for my supporters. Check out these incredible Robotics skills : https://www.c-linksystems.com/ My underwater exploration gear : QYSea Fifish V6S & V6 and Fifish V6 Expert. With a gripper to recover artifacts from the deep ! Omni directional and totally awesome for underwater exploration ! https://www.qysea.com