That sinkhole in the main spillway isn't a crater from a bomb hit, it's a COLLAPSE of the sub-grade. For a collapse of that scale to transpire, there has to be a LOT of water making it's way from out from under that dam already,....DEEP underneath.
The implications of a potential "blowout" right down at or below the reservoirs bottom are not at all good IMHO.
GTC
The least of which is the immediate aftermath, an entire regions water supply sits behind that dam. Implications are dire in a worst case scenario.
