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If the SPG had existed way back when, I suspect the multi-tank shutoff system and the R/J valve would not have been invented.
Cheap torches that could withstand the pressure changed everything, the Q-light was a marvellous thing although I destroyed a few of them too. Even today I’ll avoid using lights as it ruins your night vision and ability to work in poor vis.The SPG will be here for a very long time because the vast majority of divers will not go into or be in a zero viz environment on purpose.
If I'm diving in the dark w/o using lights, I'll close my eyes and shine my light on my SPG and the turn it off. Many of my SPGs are glow in the dark and don't emit enough light to ruin my vision.Even today I’ll avoid using lights as it ruins your night vision and ability to work in poor vis.
Younger bodies can take more abuse/recover fasterPerceived risk changes with age. Especially in men.
You only need to look at Motorcycle fatalities, or MTB injuries / cliff diving / Drink driving / Pub fights etc.
As I've got older, my perceived risk is exaggerated, probably brought on by the fear driven media economy that we live in.
At 53 after nearly 30 years of diving I manage risk by training across multiple disciplines.
I wouldn't Scuba dive without being fit enough to Ocean swim though surf for a half mile.
I also cycle a lot, and know my cardiovascular fitness.
So, I'm hedging for the inevitable incident.
At 25 I would solo dive at night with Sharks, sometimes I did this during a shark feed whilst working as a DM after a night dive.
Bounce diving after breakfast to 200 feet on air, was also not uncommon.
So young people push their limits.
Years later, I worked in Hospitals, and saw at least 6 dead cyclists, through head injuries, lying in the morgue.
That hasn't stopped me cycling, but it has developed a defensive mindset. A defensive mindset is what will keep you alive, on the street, underwater, and on a mountain.
Those who don't think like this can end up out of their depth.