When I watched it, I did feel that the plot was very unreasonable. With the diving knowledge I learned, I couldn't understand the emergency response methods of the characters. At the same time, I was thinking about how I would give first aid if I encountered such problems. First of all, will it fall so fast? This is related to density. Compared with the density of seawater, if the density of the iron cage drops a little bit slower, there is still time to balance the ear pressure. In fact, 47 meters at the bottom of the sea does not feel much different from 20 meters at a dozen meters. It's just that there is less light, the sea water is colder, and the available time of the cylinder is greatly reduced. In the movie, the heroines are in great exercise but they can persist for such a long breathing time, which is unreasonable. There is a form for the depth of the cylinder to stay. If you remember it, you can know how long it can take to save yourself at 47 meters. This knowledge is life-saving if you encounter danger in the future. Then the captain said don’t come up or you will get decompression sickness. This film has repeatedly emphasized it, but it is better to get decompression sickness than drowning. Remember, if you fall into the deep sea, the most important thing is to ascend the water while ensuring safety. . Slowly ascend the water, exhale as it rises (because the bubbles get bigger as you go to the sea surface, so you have to vomit), and then the shark will not attack you if you don't provoke it.
In fact, the theme of the film is deep sea fear, but after you truly understand the sea, you will find that the sea is actually beautiful, but we still have to treat it with awe! Under the premise of ensuring safety, explore nature bravely.
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