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Submarines also have reduced partial pressure of oxygen, (18-19%). https://www.sciencedirect.com/science/article/pii/0378427489900350?via%3Dihub https://www.sc

• JumpCrisscross 3y ago
  > Submarines also have reduced partial pressure of oxygen, (18-19%) The article defines high altitude at 1.96km, or 6,430 feet. That’s a less-than 16.5% effective oxygen atmosphere [1]. [1] https://www.higherpeak.com/altitudechart.html https://www.higherpeak.com/altitudechart.html