The Problem With Helivic's Clamp

This is an early system, so there's no mechanical interlock. So it's easy to get this procedure right, but also easy to get it wrong. No one's entirely certain why he opened the clamp here before Helivic had fully closed the door to the four chamber. And almost instantly all hell broke loose. Things got very bad. Very quickly. This is probably all over in about 10 seconds.