If you are happy enough to continue in that position...then....I offer this up for debate...
I'm sure you could understand that being a coastguard or lifeguard and not using a float, would probably lead them to think to themselves that they should know better. Also whatever their voluntary work, it does not put them on a higher tier of survival either. I bet if it's the same one I had diving off my boat the other day then he really SHOULD know better.
I completely disagree with the deep hold and camouflaged theory. If you have a decent floating polyprop or sealed tube line of enough length for your limits and to get back to the top, I cannot see the problem?
...With three years under your belt perhaps you might like a review of tactics here on the subject if you are dead sure that a float and line will possibly kill you. A lot of spearos particularly overseas go GUN>LINE>FLOAT with the appropriate use of drop weights or D rings in each situation (i.e. deep and camouflaged?).
Occasionally I have snagged and I hole dive a lot, however, perhaps you need to fine tune your entry and exit points and also your breathhold limits to take in the whole down as a well exercised routine.
I know mine and will always make sure I have the buffer zone to allow a quick slash through with the knife, however with my polyprop it always feeds and cuts through weed and overhangs, holes etc. are as per the track you take. No fish is worth your life and all the top guys with many more years of experience than I would tell you the same.
I have dived Sussex, Dorset (Portland Bill just this last weekend), Wales, Devon and Cornwall under all conditions and the only time I have not had a float on was some specific offshore boat diving with plenty of flag and top cover and we are out of sight of the general public on a headland well cornered by boat traffic.
I think the point to be made here is a divers flag and float says, I'm okay and I am involved in some sort of activity and not just floating face down on the scene of two unrecovered bodies from recent incidents.
Without assuming you don't have already, and if you may fancy some proper polyprop spearo line (not B&Q) then let me know
