Originally Posted by
MartinM
This is called the thermal layer. All you need to go is beyond the thermal layers that isolate. At some point, the temperature are no longer significant as the temperature will stay the same throughout the year.
There is more to the ocean than that. Unlike a lake it is hugely different and you are likely to get more than one layer. An ocean surface current often has a subsurface counter current and also deep to shallow currents too.
Last edited by Pontius Navigator; 1st Apr 2014 at 13:19.