The pressure at great depths in the world’s oceans reaches colossal values.

The pressure at great depths in the world’s oceans reaches colossal values. Why do deep-sea dwellers not feel discomfort with this?

The evolution of deep-sea fish took a different path, as a result, their swim bladder is filled not with air, like in ordinary fish, but with a fatty fluid. It is thanks to this feature that deep-sea fish can live at rather great depths. The pressure of this fatty liquid is balanced with the external one and the fish does not feel the weight of the water. This feature allows them to survive at the greatest depths. Also, all fish tissues are filled with water, as a result, the fish feels the same pressure from the inside and outside.