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There's an interesting aspect to be known.
Jaques Cousteau, who designed the "Aqualung", the first scuba diving air compressor (or such) in 1943, went somewhere along the Mediteranean to test it. They already took film shots back then.
In an event when they came back, 25 years later, they again took film shots.
The comparison is mind bogling. The underwater live was practically dead, when they came back.
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