The surface layer is warmest, followed by a rapid decrease in temperature in the area called the thermocline. After that, the temperature is mostly constant as you get deeper, but will tend to get slightly colder as you go deeper. The effects of lack of solar energy dominate any increase from pressure or thermal vents.
jar4ever t1_is30yz3 wrote
Reply to comment by TroyandAbedAfterDark in Does the salinity of ocean water increase as depth increases? by rhinotomus
The surface layer is warmest, followed by a rapid decrease in temperature in the area called the thermocline. After that, the temperature is mostly constant as you get deeper, but will tend to get slightly colder as you go deeper. The effects of lack of solar energy dominate any increase from pressure or thermal vents.