When an object sinks to the bottom of the ocean, it does not reach a terminal velocity like it would in the Earth's atmosphere due to the increasing water pressure and resistance. In the atmosphere, terminal velocity is reached when the force of gravity pulling the object downward is balanced by the upward force of air resistance. Once these forces are in equilibrium, the object falls at a constant speed.
In the ocean, as an object sinks deeper, the water pressure increases due to the weight of the water above it. This increasing pressure results in an increase in resistance, which acts against the motion of the sinking object. Consequently, the object does not maintain a constant speed but slows down as it goes deeper.
The rate of slowing down depends on various factors, such as the shape, size, and density of the object, as well as the viscosity of the water. Generally, the deeper the object sinks, the greater the resistance it experiences, causing it to decelerate until it eventually reaches the ocean floor.
It's important to note that the concept of terminal velocity is specific to the Earth's atmosphere and does not apply directly to objects sinking in the ocean or any other fluid medium.