If I had access to that kind of "dead" quarry, I know what experiment I'd try.
We get these buckets at work; they're how the big dessicant packs are shipped to us. They're all-metal, with a clamping-ring lid that seals very well, and around a 6 gallon or so capacity. I would love to see just how big a dry-ice depth-charge one would make.
I figure it would work to put a cinder-block inside one, fill it with water almost to the top of the block, set the dry ice on the block so that it's out of the water while sealing the lid on, and then let it tip off the side of a boat, hence immersing the dry-ice in the water. I would need to make sure this arrangement would sink.
Needless to say, it would also be a boat capable of putting some distance between itself and the drop point.
I've seen the kinds of explosions 2 liter soda bottle dry-ice bombs make in pools. I'd bet one of those buckets would make a pretty impressive depth-charge.
Alas, available quarries are not that common around here.