Tom Kann - Freedom Equity Group

For decades, human diving has been limited by one thing: oxygen supply. Traditional scuba tanks restrict how long a person can stay underwater, regardless of depth or skill.

Now, marine biologists and engineers are experimenting with artificial gill systems that extract dissolved oxygen directly from water, inspired by how fish breathe.

These devices use specialized membranes that separate oxygen from seawater and deliver it in a breathable form. Early tests show that, under controlled conditions, the technology can support normal respiration for extended periods without bulky air tanks.

While still experimental, artificial gills could one day transform rescue missions, military operations, and recreational diving by removing time as the primary underwater constraint.