Secret German WW2 tunnel discovered . How is that possible ?

Lost in time and forgotten by the world.
Massive German WW2 tunnel found in the hillside.
Secret stuff going on ?
If you like to support our work :
/ ww2historyhunter
paypal.me/WW2H...
My Email : [e-mail]
Check out my monthly WW2 diorama giveaway videos in the beginning of each month.
Beautiful WW2 dioramas for my supporters.
My WW2 exploring gear :
My metaldetecting gear :
Makro Kruzer Multi detector
Nokta pin pointer
Makro KR 40 coil
Makro KR 13 coil
Makro/ Nokta waterproof headphones
www.noktadetec...
My underwater exploration gear :
QYSea Fifish V6S & V6
With a gripper to recover artifacts from the deep !
Omnidirectional and totally awesome for underwater exploration !
www.qysea.com/
My underground explorer flashligh gear ;
Olight Seeker 2 Pro ( strong, durable , impressive beam )
Olight M2R Warrior ( you cant destroy it )
Olight X7R Marrauder ( mother of all flashlights and insane bright light )
Olight HS2 ( headlamp , very powerful )
Olight H2R ( Headlamp , versatile and extremely good for cave exploring
bit.ly/2JHLrBG