The pressure of water at significant depths can indeed have an effect on its properties, but it does not create heat in the same way that deep mines experience increased temperatures. The increase in temperature observed in deep mines is primarily due to geothermal heat from the Earth's interior, not solely from the pressure of the surrounding rocks.
In the case of water, pressure affects its boiling and freezing points. As pressure increases, the boiling point of water also increases, while the freezing point decreases. This is why water can remain liquid at temperatures below its normal freezing point when subjected to high pressure.
However, the increase in pressure itself does not generate additional heat. It simply alters the conditions at which phase changes occur. Heat is generated through other processes, such as the transfer of energy or chemical reactions. In the case of deep mines, the increase in temperature is primarily due to the flow of heat from the Earth's interior, which gradually increases as you go deeper into the Earth's crust.
Therefore, while pressure can affect the properties of water, it does not directly generate heat similar to the increased temperatures experienced in deep mines.