Nerve-racking footage captures a woman freediving through a very tight cave network, with the tunnel only just wide enough for her body to fit through.
In the 42-second-long clip, Tiffany Marie Owen, 30, from St. Petersburg, Florida, can be seen taking a breath before calmly plunging to the depths below in Ginnie Springs.
With a GoPro in one hand, she uses her other hand to slowly guide her through the underwater obstacle course until she slips through the tunnel and