I suspect he only had a recreational set on (BCD & single). I will try and talk with a LDS who's ex students pulled him out.
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Luckily the friend diving with us did in fact breath out as he swam to the surface! He only had to ascend 2 meters.I guess in your circumstance the diver had the presence of mind to breath out while ascending? Not an easy thing to do when ones mind is screaming that one is out of air as survival instinct kicks in (keep the water out and the air in).
On the assumption that the story is correct as detailed in the ABC report (and who knows if it is or isn't), if this happened maybe the diver on realising he was out of air after descending may have then shot to the surface while holding his breath in a panic, thus causing an embolism.
I would think that you would notice the problem within 2 -3 meters from starting your descend if your cylinder was closed. Won't you be able to swim upwards ? Or get out of your gear ? Very tragic that such a drowning can still happen today.
I guess not if you panic.
That's my point, people, by and large, are not taught that diving can be deadly, they are taught how safe it is, and they are not equipped with the skills, taught and trained to the level required to be useful in an emergency.