Fish have a swim bladder that adjusts buoyancy, so they can hover without effort. Sharks lack one; they must swim to pass water over their gills for oxygen and to avoid sinking. But, in our coastal visits, I've seen some bottom-dwelling sharks resting in currents—so even that rule isn't absolute. It reminds me of my studies: the textbook says one thing, but the real world, like the Bay of Bengal, always shows you an exception. That’s why I prefer the lab at Annamalai University to my coaching centre’s static notes—life isn’t a single, fixed depth for anyone.
#swimming#open-water
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