This meant he was there to help Zecchini come back up if she ran out of oxygen.
In a courageous act, Keenan risked his life to save her, bringing her back to the surface.
People who watched this heartbreaking documentary might find themselves wondering why Zecchini and Keenan had such a hard time coming back up.
He dove down to a depth of -65 feet (or 20 meters), which is roughly the height of a six-story building.
When he reached -5 meters (-16 feet), he noted that he was “definitely floating.” At -10 meters (-32 feet), he still floated but felt “a little less.”
It all comes down to physics. When a diver hits -10 meters, the pressure there is twice what it is at the surface.
This is what we call hydrostatic pressure.
Why do we sink with air in our lungs? 20 meters is quite terrifying.
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As mentioned earlier, due to hydrostatic pressure, divers become more negatively buoyant as they descend, causing them to sink faster.
