Yep, sometimes curiosity really does kill a cat.
Very interesting mystery, indeed. I thought I heard someone calling the cat, LOL.
Does it possibly contain, as rumored, an actual vimana and the weapon capable of scorching the earth?
If such a discovery was uncovered, how would the ppl/gov't of India handle such a thing?
As far as opening the door with vibrations, then Ohm/Om would be the logical first guess. Could it be from a certain megahertz vibration, 432 theta, 528 solfeggio, 936...... try the HU chant.....can't hurt, but who knows?
Those Indians writings, the language, words, they are really difficult to grasp and fully comprehend. There are many writings, still yet to be deciphered.
I would also wonder, if some of the dowsers or remote viewers, would be able to "see", what could possibly lie behind the door?
I do believe there is true knowledge, just don't know how to figure it out.

This is an interesting read, imo.
Flying Machines in Old India
I would love to see and learn more. Please do share pics and good luck.