Question

as a swimmer goes from the surface of water to a depth of 20 m the change in pressure on his body is nearly

Answer 1

the pressure on his body is nearly
$20 \times 9.8 \times 1000 = 196000pa$
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Answer 2

As a swimmer goes from the surface of water to a depth of 20 m the change in pressure on his body is nearly 297.5 kPa.

gage pressure = 20 m * 9.810 kN/m^3 = 196.2 kPa

absolute pressure = 196.2 kPa + 101.3 kPa = 297.5 kPa (approx. varies with barometric pressure)