Why Deep-Sea Divers Sound Like Chipmunks | Smartest Year Ever (Mar 4, 2025)

Saturation diving is one of the most extreme, dangerous, and downright bizarre jobs on the planet. These deep-sea specialists work at depths of 1,000 feet, living inside pressurized chambers for weeks to survive the crushing pressure. And if they try to surface too fast? Their blood fizzes like a shaken soda can—a one-way ticket to decompression sickness.

To breathe at these depths, divers replace nitrogen with helium, preventing narcosis and allowing them to function. But helium has one unforgettable side effect—it makes them sound like chipmunks. That’s right, some of the toughest workers on Earth spend their days sounding like prank callers on helium.

How do they survive these depths? Why does helium change their voices? And what happens if they don’t decompress properly? Gordy dives deep into the wild world of saturation diving.