Investigate acoustic wave mechanics in water. Calculate high-precision sound velocity ($c \approx 1,482\text{ m/s}$, 4.3× faster than air), bulk modulus incompressibility ($K_s = \rho c^2 \approx 2.19\text{ GPa}$), and active sonar round-trip ping telemetry ($d = \frac{c \Delta t}{2}$).