How does the speed of sound change as the sound of a boat engine moves down to the depths of the ocean?

the speed gradually increase as the temperature of the water decrease

the speed increases and then decreases as the temperature of the water increase

the speed decreases and then increases as the pressure exerted by the water increases

the speed gradually decreases as the pressure exerted by the water decreases

The speed of sound change as the sound of a boat engine moves down to the depths of the ocean The speed increases and then decreases as the temperature of the water increase. Sound do not travel faster in water than air due to the resistance. The salt and water molecules of the ocean cause interference for the sound wave to travel across it. It it had travel through air, then you can hear the sound of the incoming boat. But if it goes down into the water, and as you know it, going deeper into the water increases the pressure all the more that it muffles the sound of the engine of a boat. That is why it increases then decreases its sound as it goes down the ocean.