The 27-year-old surfer was left spitting up blood after being repeatedly smashed under water for minutes after the monster wave broke.
Porcella told Surfing Life magazine of the harrowing experience.
"It was the most violent thing – I got annihilated," Porcella said.
"I was bounced, pin-balled on the reef, the whole nine yards. Just up and over and up and over. It held me under pretty long. My life-vest got blown off right away, and then the second wave drilled me – I actually hit the bottom even harder. Hit my back, my knees, and then I got about four more waves on the head after that… washed over the reef."