One thing to watch out for during the swim in open waters is the organic life hazards like Jelly Fish (the most common), Portuguese Man Of War (not so much), a shark (rare), and salt water crocodiles (low probability) hence I prefer to use my scuba diving face mask because it gives a much wider and clearer view compared to a swimming goggles.
Other non-organic hazards are fishing nets, boats, and sharp objects that are submerged.
Strong currents are common in my place particularly the rip currents and have taken many lives yearly but is not really a threat for me.
Looking at the graphs of function growth, I noticed the growth for square root function is similar to the growth of a logarithmic function and thought they are the same but turns out logarithmic function grows much slower than the square root function and that square root function grows much slower than the linear function.
In short, the function growth of square root function is bounded on top by the linear function's and bounded below by the logarithmic function. Logarithmic function still grows the slowest.