Can you drown in liquid oxygen? Yes. humans are not able to breathe pure oxygen well. mix in around twice as much liquid nitrogen and that should be fine.

A fluorocarbon called perfluorohexane has both enough oxygen and carbon dioxide with enough space between the molecules that animals submerged in the liquid can still breath normally. This unique property may be applied to medical applications like liquid ventilation, drug delivery or blood substitutes.

Being so much more viscous than air, liquid is difficult to breathe. Some of the Seals reportedly developed stress fractures on the ribs cause by the sheer force of trying to get a liquid in and out of the lungs.

All surface-breathing animals are subject to decompression sickness, including aquatic mammals and free-diving humans (see taravana). Breathing at depth can cause nitrogen narcosis and oxygen toxicity. Holding the breath while ascending after breathing at depth can cause air embolisms, burst lung, and collapsed lung.

Human lungs are not designed to extract oxygen from water to be able to breath underwater. When you breathe in air, the air travels from your nose, down your trachea (windpipe), and into your lungs. Since humans do not have gills, we cannot extract oxygen from water.

Artificial gills are unproven conceptualised devices to allow a human to be able to take in oxygen from surrounding water. As a practical matter, therefore, it is unclear that a usable artificial gill could be created because of the large amount of oxygen a human would need extracted from the water.

Because our bodies contain nearly 70% water, the air in our lungs is almost completely saturated with water vapor (water in gas form) and is the same temperature as our bodies (98.6oF). Cold air cannot hold as much moisture as warm air.

The low temperature of liquid oxygen and the vapors it releases not only pose a serious burn hazard to human tissue, but can also cause many materials of construction to lose their strength and become brittle enough to shatter.