Air pressure is bad enough, but any time you've got water above 100c and/or 1 atmosphere of pressure, you're at risk of a steam explosion, which is far, far dea

Air pressure is bad enough, but any time you've got water above 100c and/or 1 atmosphere of pressure, you're at risk of a steam explosion, which is far, far deadlier. Water expands to about 1800 times its volume in the process of flashing off to steam, and it can displace all the air in a room, leading to people inhaling steam, and being burned from the inside. Steam explosions are terrifying. Boilers are extremely hazardous things to operate without proper training and supervision.