The temperature inside the Mariana Trench is extremely cold due to the lack of sunshine, hovering approximately 34–39 degrees Fahrenheit. Light from the surface filters down to the deepest part of the trench, but not enough to heat it significantly.
It is estimated that there is a slight warming effect from water vapor generated by the constant flow of ocean currents below the trench. The heat is lost into the surrounding space so effectively that it does not affect the overall temperature of the planet.
In conclusion, the temperature in the Mariana Trench is very cold.
The Mariana Trench is perpetually black due to its tremendous depth, and the temperature is just a few degrees above freezing. At the bottom of the tunnel, the water pressure is a crushing eight tons per square inch, or approximately a thousand times the usual air pressure at sea level.
Things that would kill you in another world in two seconds here take ten minutes: snakes, spiders, scorpions, jellyfish, and now even sharks can swim through the waters of the Mariana Trench. The pressure alone would be enough to crush most creatures.
However, there are some animals that live in these conditions. Deep-sea fish were first discovered by Japanese scientists in 1969. There are still discoveries being made about these organisms today.
Scientists have also found evidence of bacteria that live in extreme conditions, including deep under the ocean floor. These bacteria may one day provide information about how to combat human diseases that arise from similar environments (e.g., cancer).
People have died in the Mariana Trench, usually when their submersible vessel sinks after running out of fuel. Some deaths were probably accidental, but others may have been murder committed by people who knew that life could never be recovered from such depths.
In conclusion, yes, the Mariana Trench is dangerous.
Water temperatures in regions such as the Mariana Trench (or the Marianas Trench; both spellings are regularly used) range from 34 to 39 degrees F. (1-4 degrees C). The pressure at that depth is about 1 million times greater than at sea level.
The water in the trenches is very cold because it has no contact with the sun or any other source of heat. Water molecules are constantly moving around, trying to find a stable position like a wobbly ice skater walking on smooth ice. But sometimes when two molecules collide they will match up and share one of their properties (such as a charge or a dipole moment), much like what happens when you brush your teeth together. This means that if one molecule has a positive charge and another has a negative charge, they can still connect with each other even though they are opposite in charge. This connection allows them to move together as one unit.
As water molecules move around under pressure, they tend to go where the energy supply is greatest. Since there is less energy in deep waters, more and more molecules join together until all the water is frozen into a giant crystal.
At the bottom of the Mariana Trench, where the temperature is nearly constant at 36 degrees F., some scientists have seen ammonia crystals as big as buses.