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There was no foreign object wedged between the bung and the glass. That was a bung drilled with 2 holes, one for a thermowell and one for an airlock. Certainly, the bung could have added pressure to a pre-existing imperfection but I doubt it was the cause of it.

Agreed. I have one other theory. The chamber pictured is a freezer. The sides can get really cold when it's running to drop the temp. It does not seem to me that there would be enough temp fluctuation to be a factor. but maybe...

I'm open to other theories. I promise that it was not dropped.

The airlock plugged and the stopper was so tight it blew up.

jbaysurfer: The blue in the pic is a heat belt, it lived. The stc 1000 was fortunately on the outside of the freezer and wasn't touched. The bung has two holes in it, one for the thermowell and one for the airlock. It was purchased at my lhbs and has worked fine for ~10 batches. In this...

I like carboys. I've been using glass for 2 years with no problems up until last night. I've heard horror stories about glass but figured that was "other people's problems". This is what my Labor Day Weekend Hefe did last night. WY3068 +32 hours. Fortunately, no one has been hurt...