Apparently, Ukrainian drones pushed through and started a chain reaction.
Explosions reportedly continued for hours, and authorities evacuated nearby settlements. Initial reports indicate that the site, previously protected by one of Russia’s densest air defense networks, suffered catastrophic damage.
Business insider has videos of the explosion.
https://www.businessinsider.com/blast-rocks-russian-ammo-depot-kremlin-says-explosives-mishandled-2025-4
The article also says Ukraine hasn’t taken credit for the explosion, and that Russia has had accidents like this in the past.
Fuck Russia and all that, but now I’m thinking OP is full of shit.