Here is the scenario. An astronaut is conducting experiments inside of a laboratory module within a space station when all of a sudden, a fire breaks out. The astronaut escapes from the laboratory module he was currently using and then proceeds to seal it off using an airlock. He then deliberately depressurizes the laboratory module of it's oxygen, thereby suppressing the fire inside of it. Is this plausible? Oxygen is what causes fire to spread so quickly. If there is no oxygen at all within a space capsule, would that stop the fire completely?