In 1991, eight people sealed themselves inside a glass world in the Arizona desert for two years, and the experiment nearly unravelled when the oxygen began disappearing from the air they were breathing
In nearly seventy years of deep-sea exploration, researchers compiled 43,681 submersible dive records — and found that humans have visually observed less than 0.001% of the deep seafloor, an area roughly the size of Rhode Island, according to a Science Advances study published in May 2025.