Done hyperbaric chamber aka HBOT at 1.8 ATA.
I've managed to fit, AMA

• prime coxswain /koda
• network state /subwork • depin in the sky /spacecoin • angel n' lp in few funds
• yangwao.twitter •

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Felt like I'll be landing on Mars on this trip. 
At first one may feel like a Japanese capsule hotel, except no electronics inside as due 97% oxygen inside and high pressure, it could easily end like early Apollo ships on ramp and internally blow.