... nonetheless we all do dive/hunt alone, and it's very often, for two main reasons: 1) no buddies available and /or 2) for the intimate pleasure of an introspective experience.
...
I would add a few additional reasons:
3) less chance of shooting someone (your partner)
4) less chance of being shot (by your partner)
5) quieter in the water -- disturb the fish less.
6) less constraints on your time/activities (only have to worry about when you are feeling tired/cold/hot/sick/hungry/thirsty/cramping). I find this particularly liberating.
On the other hand, dying sucks. So you need to think about managing peripheral risks as much as practical. I dare say we all dread the day will come when we loose a friend from this forum. I saw some figures once concerning climbers - turns out driving to climbs is more dangerous than climbing. I suspect the same is true for spearing, at least for those of us that travel a fair distance on smaller roads.
BTW I am surprised that several people mentioned cramp as a concern. I get
cramps all the time. I can cramp my calves any time of the day or night if I feel like it. I don't find it a significant problem (although I have seen people shreiking almost in tears - so perhaps others are affected differently). Last year I got a thigh cramp in the water (thigh cramps can be considerably stronger & more painful than calf cramps - have only experienced that twice in my life) but even that is not a serious problem. Just stay calm & deal with it (move the effected limb or wait for it to subside).
"Two spearos, one gun"/"one up, one down" - this does sound like a good approach. You'd need to work out a safe, efficient system but it might also help enforce a good resting/diving ratio (3:1?). Having your butler manage your float, line & stringer would be ideal of course
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Recently one of the Bahraini royals died spearfishing...
Condolences. Who'd have thought it: spear fishing - the sport of Kings.