We have wrecks here which have air pockets in them (left over bubbles from scuba divers). I have breathed in such air pockets while freediving, and then done 'free ascents' slowly exhaling the air. I don't recommend it. There are many dangers, including nitrogen accumulation (leading to DCS), as well as embolism.
Although I figured out how to exhale as I ascended, if you screw up you're dead (a real danger the first few times). Then, even worse, after many such dives I ascended once and 'forgot' I had extra air to exhale. Suddenly my lungs felt like they were going to explode and I suddenly realized I needed to exhale, ....
Eric Fattah
BC, Canada
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