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In page Timeline of diving technology:

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  • The movie "The Frogmen" was released. It was set in the Pacific Ocean in WWII. In its last 20 minutes, it shows US frogmen, using bulky 3-cylindered aqualungs on a combat mission. This equipment use is anachronistic (in reality they would have used rebreathers), but it shows that aqualungs were available (even if not widely known of) in the US in 1951.[citation needed]
  • The US Navy started to develop wetsuits, but not known to the public.[12][13][14]