At what depth does fresh water become super cooled?

Question

At a certain depth the water molecules can't freeze because of the pressure of the colum of water above it becomes too great for them to expand so consequently they can't freeze and thus becomes "Super cooled water", but at what depth does this occur? And does temp have any effect ?

Answer 1

There isn't a simple scalar answer. See the second reference for a detailed phase diagram of water to see how this varies with temperature and pressure. Of course, the details will be different for sea water or anything other than pure water.