> A cylinder that lasts for an hour near the surface will only last for a couple of minutes at 100m And unfortunately for saturation divers, you can't pressuri

> A cylinder that lasts for an hour near the surface will only last for a couple of minutes at 100m And unfortunately for saturation divers, you can't pressurize cylinders on-site to make up for the difference. Pressurizing your tank to 210 bar (which puts the same stress on the cylinder walls as 200 bar at the surface) doesn't change the factor-of-10 increase on the other side of your P1V1=P2V2 balance. Not to mention that you need even more air for decompression time...