The level of environmental hypobaric hypoxia that affects climbers at the summit of Mount Everest (8848 m [29,029 ft]) is close to the limit of tolerance by humans. We performed direct field ...

During bubble nasal continuous positive airway pressure (B-NCPAP), gas flows through the expiratory limb of CPAP tubing submerged underwater to a depth in centimeters considered equal to the desired ...

Figuring out how the human body can withstand underwater pressure has been a problem for over a century, but a ragtag band of divers is experimenting with hydrogen to find out. Two hundred thirty ...

Hannes Keller, a Swiss deep-sea explorer who survived a record descent to more than 1,000 feet in a diving bell during a 1962 expedition that helped open new frontiers in ocean research but claimed ...