Sperm whales and the bottle-nosed dolphin are know to dive to depths near the record possible in pursuit of their food. The greatest difficulty experienced in such excursion is maintaining the proper ratio of blood gases. This is a problem for human divers as they take their air supply with them - but as whales and dolphins don't breath when they dive the whole of this complex science isn't applicable to them.
The truly horrific pressures at these depths are managed by matching the blood pressure to the external pressure. Cod-fish hauled up from great depths bloat something terrible which is what happens to deep-sea divers if they don't go through a prolonged decompression after the dive. Whales and dolphins however don't exactly increase their blood pressure. What they do is let their blubber (of which they have considerable) compress. This results in an constrictive pressure for the body. Whale and dolphin actually shrink a little in size when they go down. When they come up (quickly) the blubber decompresses and the internal pressure of the animal returns immediately to normal without the blood pressure ever having increased in and of itself
The temperature of (pure) water never goes below +3'C this is where water is the most dense. If you decrease the temperature of (pure) water any further it actually become less dense and proceeds to float. This is why ice floats on water. So the depths of the ocean is never below +3'C. This is cold but not terribly, it won't produce frost bite. Whales and dolphins are insulated by layers of blubber and really don't spend all that long in the depths. Think of sauna enthusiasts running from a sauna and jumping into freezing water. This is far more a temperature difference than what whales and dolphins experience in diving to the depths and the change happens far more slowly. If sauna enthusiasts find the experience 'pleasurable' why should whales and dolphins be discouraged by something far less traumatic.
they don't...
Equalization of pressure. Most of them don't have enclosed areas that will be subjected to pressure.
Both temperature and pressure increase with depth.
As depth increases, pressure also increases due to the weight of the water column above. Temperature affects pressure by influencing the density of a fluid; warm water is less dense and exerts less pressure than cold water at the same depth.
As Earth's depth increases, both temperature and pressure increase. The increase in temperature is primarily due to the Earth's internal heat and geothermal energy. Pressure increases with depth due to the weight of the overlying rock and materials compressing the layers beneath.
The degree of temperature and exertion of pressure by the molten materials (magma) within the mantle is directly proportional to its depth. This means that, the deeper you go down the mantle the higher the degree of temperature and pressure exerted.
No, the relationship between temperature and depth is primarily influenced by factors such as geothermal heat flux and thermal conductivity of the material, while pressure at depth is mainly dependent on the weight of overlying material. Temperature generally increases with depth due to geothermal heating, while pressure increases with depth due to the weight of the material above.
As depth beneath the Earth's surface increases, both temperature and pressure increase. This is due to the weight of the overlying rock and the Earth's internal heat. The increase in pressure and temperature with depth is known as the geothermal gradient.
Any decent dive computer can withstand greater pressure than you can.
Both increase.
Pressure and temperature increase with depth beneath the surface of the Earth.
The water temperature at depth calculator offers features such as depth input, temperature input, and calculation of temperature changes based on depth. These features help determine accurate temperature readings in different water depths by accounting for the effects of pressure and depth on water temperature.