Why is it dangerous for a diver to take hot shower after deep dive?

It is dangerous for a diver to take a hot shower after a deep dive because of the risk of decompression sickness, also known as "the bends".

During a deep dive, the diver's body absorbs nitrogen gas from the compressed air they breathe. When the diver ascends, the pressure decreases and the nitrogen gas comes out of solution in the body. This can cause bubbles to form in the blood and tissues, which can block blood flow and cause serious injuries.

Taking a hot shower after a deep dive can increase the risk of decompression sickness because the heat causes the blood vessels to dilate, which allows more nitrogen bubbles to circulate in the body. This can increase the risk of bubbles forming in critical areas, such as the brain or heart.

In addition, the heat from the shower can cause the diver to feel faint or dizzy, which can increase the risk of an accident.

For these reasons, it is important for divers to avoid taking hot showers after a deep dive. It is recommended to wait at least 12 hours after a deep dive before taking a shower, and to use warm water instead of hot water.