Myth Hunters Himmler and The Holy Grail
Heinrich Himmler, the #2 in Nazi Germany after Adolf Hitler, was obsessed by mystical things. He wanted to recreate the "Pagan" spiritual framework of German Ancestors, and he sought out objects of spiritual power. That included the Holy Grail.
He hired people to do the research to find things.
One item they focused on is the oral traditions passed down by the Troubador's in Medieval France. Part of that tradition was songs about the Cathar's. The Cathars are supposed to have held a treasure that may have been the Holy Grail.
A "local story" was uncovered saying that the treasure had been smuggled out. Supposedly the Holy Grail was hidden in caverns near Monstegur.
Within the SS, one unit tasked with researching the history of the German race. They were researching ancient history, but they weren't all that concerned with the truth. For example they rewrote the Bible that among other things showed Jesus was not Jewish, but instead Aryan.
Myth HuntersHimmler and The Holy Grail - YouTube
Source: VSO Knowledge TVThe story of the NAZI Heinrich Himmler's search for the Holy Grail during World War 2.