Secret entrance found by drone in German WW2 underground tunnel. Hitler`s Gold or what ?

Drone finds secret entrance in German WW2 underground tunnel.
Rumors has it that even Hitler himself took interest in this location..
What is up there ?
Part 1 here :    • Secret passage in German WW2 tunnel f...  
Part 3 here :    • Secret passage in a German WW2 tunnel...  

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