Breathe deeply [back story]

Rebreathers, an advanced kind of scuba-diving gear, let divers stay underwater for hours, silently, like the “fish men” that Jacques Cousteau envisioned at the dawn of the age of underwater exploration. So we jumped at the chance to review an innovative new rebreather. And then we had to wait almost a year before we could actually publish the review (“Winner: Poseidon Discovery,” in this issue).