The ocean is really deep like 2'400 meters kind of deep (which is 7,874.0157 feet).
The ocean is divided up into three sections. Surface is the top to about 200 meters (or 656.16798 feet.)
The next layer is Thermocline is from 200 meters to about 700 meters.
And the last layer is called the Deep Zone is 700 meters to the ocean floor 2400 -plus or minus.
The top of that water in a tropical water region could be 30 degrees Celsius (or 86 degrees Fahrenheit.)
Polar arias could be negative -2 degrees Celsius (or 28 degrees Fahrenheit.)
The top of the water in an averaged aria at the surface could be about 81 Fahrenheit (27 Celsius.). And at the deep zone and at the floor is about 36.5 degrees Fahrenheit or 2.5 Celsius.