La plongée : diving

Résumé du document

Ce document est une présentation orale entièrement rédigée et complète, en anglais.

L'exposé traitre de la discipline sportive qu'est la plongée.

Extraits

[...] In the relatively recent past, people used full diving-suits, with a cosmonaut-like helmet and air supply provided by manual pumps on the surface, but this is totally outdated. Here I will focus on the modern practice. So, to begin with, why would you want to go diving? Well, I think it is very interesting because the marine world is almost unexplored and what you sea in the bottom of the sea is just amazing. Of course you can enjoy swimming in a free environment that has no limits because oceans make up the majority of the Earth's surface and their volume is gigantic. [...]

[...] Another type of diving is in a cage, which will protect you from sharks. Now, if you are really interested, I can give you information on where to practice it. The best places are no doubt in lagoons in the Pacific or in the Caribbeans and off the coasts of Mexico. As a few examples, I could cite Cozumel, the Great Barrier Reef in northeastern Australia, Polynesia. But if you cannot go that far, you can practice in the Mediterranean. [...]

[...] First of all, you cannot breathe independently underwater, you don't have gills, so either you use a compressed air apparatus, which is called a scuba, and that may last several hours, or you must breathe in as much air as you can and remain in apnea. The record was set at 11 minutes and 35 seconds, whereas most people can only last about 3 minutes, but it was static, which means that the recordman, who is French, did not make physical efforts. So if you prefer to flow around, you really won't last long. If you have the natural reflex of breathing, your lungs will fill with water and you will die. [...]

[...] If you don't, you will suffer traumas in your brain, your lungs, your ears or your tissues because of oxygen bubbles that will form. In all cases, there is a limit for all humans, which is about 40 meters for fans and down to 120 meters for super-professionals, but then it gets dangerous. As a I said, there is scuba-diving, but you can only do freediving, that is to say, with little equipment if you remain near the surface. That is what most tourists do. Like in scuba-diving, you may use water-proof glasses and fins or flippers to move more easily. [...]