Psychedelic drug ayahuasca could treat PTSD, early studies hint. But exactly how it works isn't clear.

Kegan Gill .

EDITOR'S NOTE — This story includes discussion of suicide. If you or someone you know needs help, the national suicide and crisis lifeline in the U.S. is available by calling or texting 988. There is also an online chat at 988lifeline.org.

In 2014, Navy fighter pilot Kegan "Smurf" Gill was at the controls of an F/A-18 Super Hornet when a catastrophic malfunction sent the jet into a 695 mph (1,118 km/h) dive. He ejected seconds before impact and survived massive trauma: broken limbs, a shattered neck and a severe brain injury.