This is either the weapons-storage area explosion, or the experimental nuclear-powered jet/rocket engine that blew up in the last ten days.
I’ve seen a lot of conventional weapons explosions (made a few of them myself). None of them have ever looked like this.
Ahh. Fixed it. Raw link below as well.
Saw another article this morning, more video of this, where the Russians admit it was their nuclear scramjet project.
https://m.youtube.com/watch?feature=...&v=Y4c6Lqt_1HU