The human body can be injured. Imagine pretending to be a mermaid in cold water during the cold winter. It's actually very uncomfortable and cold. The most uncomfortable thing about being underwater is when you have a cold. Your nose is uncomfortable and the pressure in your ears cannot be balanced. The whole performance boils down to ear tingling.
The aquarium water is made of artificial sea salt, prepared according to the salinity level of real sea water. Every time I get out of the water, my face always hurts.
After being soaked in “sea water” for a long time, “Mermaid’s” skin will become rough and often inflamed. Even hair will gradually lose its shine due to prolonged soaking in salt water.