Hamster3null: In the event that the fire is so inconveniently located that it burns through the bulkheads separating the cargo hold from the passenger cabin, halon would leak through the holes and would fail as a fire suppressant, but it would not by itself kill anyone or displace oxygen anywhere.
Thanks. I do remember the primary reason we used it was because water from sprinklers would ruin millions of dollars of equipment, and Halon wouldn't.