I’ve done some work on our large Red River ammo depot (which most are decommissioned or extremely old ordnance) and knowing how those facilities are designed, I am at a loss on how the facility can keep having secondary detonations that are leapfrogging the entire facility.
If they use any form of compartmentalization approach then storage of ordnance should be contained and this wide spread multiple explosions should not really be happening.
The most obvious point here is this level of destruction is not possible due to just a shot down UAV.
Next, either this is a complete design flaw (which is unlikely) of the facility or the Russians got caught with multiple storage doors open at once. This either implies that the Ukraine UAVs hit them when they knew large transfers of munitions would be happening, the Russians violated the most basic sets of ordnance storage mantras by essentially having multiple blast doors for several ordnance bunkers open at once, or the storage plan for these cruise missiles are as such that they are trading safety and secondary blast protection for convenience of access.
This is more than likely an act of hubris by the Russians thinking them being so far into the interior nothing could reach them.
Also, the fact that this is the storage for much of their cruise missile production is a huge deal. Without those limited stocks of their more modern munitions any attack on the Ukrainian interior will require using much less sophisticated armaments and there mean the launch point will have to be much closer to the front. Needless to say, that is a huge problem for Russia from both a tactical and logistical standpoint.