A Burning Smoke From The White House Tunnels???

I am the biggest fanatic of the YouTube channel called P6 Productions.
Its owner is a man from Washington DC, and once he hears some news and speculations for the White House, he takes his camera with him and rushes to film it.
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If you follow his channel, you could see everything happening around the White House.
He is our reporter, and we should give him a salary! He must be proud to read this.
Let’s get serious now. The boy is doing such severe work, and he helps us a lot.
Numerous people share posts and videos from the smoke around the White House. It is probably coming from the underground tunnels.
Below we present you a video of the smoke so that you can see it on yourself!
Do you know what it is?
It looks like smoke, but what are they doing down there?
Are they burning something?
If you know what is happening there, you can comment below.