[RandyRep]

Right. I knew that.

But late at night, I used the word "explode" to mean a pressure-generated burst (through some sort of path to the surface) into the atmosphere rather than a chemical reaction burst.

The way the original report was written, it sounded like they were going to pump caves and underground vaults with CO2. A later post said that was quite common.

[GATOR NAVY]

I think this explains what you're talking about. Interesting info on the CO2 eruption from a lake in Africa that killed over 800 people.