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I had a very exciting explosive decompression scene two days ago, happy to share how I ruled and how it played out.

Situation: 4 PC's were trying to make their way from one ship to another (via Umbilical). The player in the lead was an Engineer who found that the access hatch would not open on request. He used Heavy Machinery to break the hatch open, thus severing the umbilical connection and causing the explosive decompression.

Now, the rulings by me. I guessed it would take three rounds for the entire atmosphere of THAT particular ship deck to lose all atmosphere. For the first round, I inflicted a forced Stamina check -3 if they wanted to move forward without being sucked toward the breach, Stamina -2 if they simply wanted to hold themselves in place. Second round -2 to move forward without losing control / -1 to hold in place, Third round -1 to move forward without losing control, Fourth round you're in vacuum no longer resisting the force of escaping atmosphere.

It caused a very fun bit of some characters tumbling into one another. The funnest bit was when the third player in order Panicked with a result of Drop Item in the second round. I was thrilled use this as an opportunity to cause the three vials of black goo he was carrying to spill out of his pockets and shatter. The resulting spray of black goo (again, being carried outward by the decompression), splattered against the backs of the spacesuits by people further ahead.