What is the final pressure inside the hole?

Dry ice has occasionally been used as an "explosive" in mining. A hole is drilled, dry ice and a small amount of gunpowder are placed in the hole, a fuse is added, and the hole is plugged. When lit, the exploding gunpowder rapidly vaporizes the dry ice, building up an immense pressure. ume that 306 g of dry ice is placed in a cavity with a volume of 0.790 L and the ignited gunpowder heats the CO2 to 680 degrees C