At first the barracuda were at the top of the food chain. They were pointing into the current waiting for some small fish to get swept passed into their jaws.
I was under them trying to get a backlit photo.
Then came the danger time. The barracuda – about a thousand of them – started to form a protective circle. They were no longer at to the top of the food chain. There were sharks below.
The barracuda form a circle so that together they get a 360-degree view. If two thousand fish-eye lenses are watching for a shark to attack, the whole group gets the advantage of an earlier warning.
They were so elegant. They were mesmerising.
Again came the danger time. This time for me. No; not the shark. Sharks are too smart to attack two metres of bubble-blowing creature. That presents unknown danger to them. (If only they knew how vulnerable we divers really are!)
No; the danger was being so preoccupied in this deep-blue display of nature that the current might take me either away or down or that I might be concentrating so much on taking pictures that I would forget to check my depth gauge and spend too long, too deep for safety, or worse rise too quickly allowing dangerous nitrogen to bubble in the blood. It is like bubbles in a softdrink bottle forming when the lid is taken off releasing the pressure. Little bubbles can stop blood flowing to precious parts of the lungs, brain and joints and can cause tiny blood vessels to burst.
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