The Mariana Trench is the deepest part of the world's oceans, reaching a depth of approximately 36,070 feet (10,994 meters). At such extreme depths, water experiences tremendous pressure, which affects its boiling point.
The boiling point of water generally decreases with decreasing pressure. In the case of the Mariana Trench, the pressure is incredibly high, and as a result, the boiling point of water is significantly elevated compared to normal atmospheric pressure.
At the bottom of the Mariana Trench, where the pressure is estimated to be around 1,086 bar (approximately 1,083 times the atmospheric pressure at sea level), the boiling point of water is estimated to be around 406 degrees Celsius (762 degrees Fahrenheit). This temperature is significantly higher than the normal boiling point of water at sea level, which is 100 degrees Celsius (212 degrees Fahrenheit).
It's important to note that these estimates are based on theoretical calculations and models, as direct measurements at the bottom of the Mariana Trench are challenging.