When an MRI machine has a quenching event, it's a very serious deal. All the energy from the electromagnet gets dumped as heat, which boils off the coolant very

When an MRI machine has a quenching event, it's a very serious deal. All the energy from the electromagnet gets dumped as heat, which boils off the coolant very quickly. MRI machines have to have a quench pipe which allows the now-gaseous helium to escape to the outside just in case of such a thing happening. The LHC had a quench event in 2008, which explosively vapourised about 6 tonnes of helium, resulting in considerable damage, and it took more than a year for the accelerator to come back online.