[1rudeboy]

I can’t see this affecting drownings unless it affects buoyancy somehow.

[Locomotive Breath]

Worn out swimmers drown.

[TalonDJ]

I can’t see this affecting drownings unless it affects buoyancy somehow.

Serious triathletes swim multipule miles at a time. Given a big patch of this sort of water and suddenly their workout becomes 15 to 40% harder than they expect. So they wear out overly fast and suddenly get into trouble for no apparent reason.

[holden]

I suppose if you're a super-triathlon geek, you pace every event to the very edge of your ability to endure. If you have to expend an extra 30% of your energy budget, on which you didn't count beyond 10%, it could bring you to a in-water collapse....
thrash, thrash, thrash, thrash...
ploomp!
HF

[Condor51]

**** I can’t see this affecting drownings unless it affects buoyancy somehow. ****

There was a program a while back on the National Geo Channel about 'Killer Lakes' in Africa.

The scientist found that massive amounts of CO2 were being fed in to the lakes. It was kept at the bottom by the weight of the 'normal lake water' above until the CO2 reached such a volume it over came the water weight and literally exploded. The CO2 gas cloud then traveled with the wind and suffocated anyone in its path.

An experiment was then done in a lab about these massive amounts of CO2 rising to the surface and they found it also affects buoyancy that boats will sink (and so would a swimmer). They then hypothesized that this CO2 anomaly could explain boat/ship disappearances in the Bermuda Triangle. [CO2 bubbles rising from the sea floor have been found in the Bermuda Triangle]