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At the depths we're talking about that would not be possible: "Decompression from these depths takes approximately one day per 100 feet of seawater plus a day. A dive to 650 feet would take approximately eight days of decompression."

This is why saturation divers spend significant amounts of time in a pressure vessel after a period of diving to decompress.

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The article is very light on technicalities but as far as I can tell, this expedition is WAY outside the sat territory. Sat divers do perform "seawalk"s during their missions, so they do need to perform the necessary steps to adjust to pressure changes.

This can't be the case here, they were inside their submarines the whole time.

ps: 100 feet = ~30m, 650 feet=~200m

Good point. You could maintain a more reasonable pressure inside a submarine.

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