In a bathysphere, where the inside is at atmospheric pressure, tens of thousands of feet.
In a hard suit, where the inside is at atmospheric pressure, a thousand feet depending
on the suit. Ditto submarines.
Scuba diving with compressed air, about 100 feet before you get nitrogen narcosis.
Free diving, with weights pulling you down, I think the record is something like 500 feet. People die trying this.
"Technical" diving, with oxygen/argon/helium mixtures, hundreds of feet.
Records are much deeper than people can actually work.
Note: messing around diving with home-made compressors or no training can kill you real fast.
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The deepest recorded ocean dive by a human is around 35,858 feet (10,928 meters). However, most recreational divers typically stay within depths of 130 feet (40 meters) due to safety concerns such as nitrogen narcosis and decompression sickness.
Most people would not want to go out in the ocean away from the shore because of sharks and the water is too deep reaching from 30 ft, 40 ft, or hundreds of feet at a sudden fall. For diving, divers have been recorded to reach depths of 500 ft below the ocean surface.
Scuba divers can work at 109m if they are very cautious rising to the surface.http://www.divediscover.whoi.edu/robotics/deep.html
According to diving experts, humans can free dive up to 500 feet below the sea and survive decompression sickness due to low oxygen levels.
The record unaided dive -- not using weights or flotation -- is about 100 feet for women and 120 feet for men
No, your body does not absorb salt water from the ocean when you swim in it.
A polar bear would not be found in a deep ocean ecosystem. Polar bears are terrestrial animals that inhabit Arctic regions and are not adapted to survive in deep ocean environments.
Jellyfish swim by contracting and relaxing their bell-shaped bodies, pushing water behind them to propel themselves forward. This movement is called pulsing, and allows jellyfish to move through the ocean.
Yes, dolphins are considered nekton. Nekton are organisms that are capable of swimming actively in the water column, regardless of the direction of water flow. Dolphins are highly efficient swimmers and can actively move through the water to hunt and navigate.
The deep sea biome typically has very low precipitation since it is located far below the ocean surface where rain does not reach. Instead, the primary source of water in the deep sea biome comes from currents and upwelling of nutrient-rich waters from the ocean depths.