Many people expect the waters of the ocean to be chilled cold as no sunlight reaches its depth while this also come out to be true. The water temperature ranges between 34 to 39 degrees Fahrenheit. But the question is can the water get hot too ? Yes the water gets hot too. 

There are hydrothermal vents throughout the trench. The water that comes out of those vents would be enough to scald anyone at 700 degrees Fahrenheit. Anyone without any hard vessel who tries to reach those vents will be crushed instantly due to tremendous amount of pressure built into the depths.