Warning: strong stomach needed to look at the poor lad's legs.

Warning: graphic images Sam Kanizay’s You’ll probably want to steer clear of the water for a while after witnessing poor’s ocean ordeal The 16-year-old went for a quick dip after footie practice at Dendy Street Beach in Brighton, Melbourne But instead of a soothing swim, Sam’s legs were devoured by mystery sea creatures. “When he got out the ocean, he described having sand on his legs, so he went back in the water,” his dad Jarrod Kanizay told AAP. “He went back to his shoes and what he found was blood on his legs. “They ate through Sam’s skin and made it bleed profusely.”

Poor Sam's legs. Source: Jarrod Kanizay via AAP

Terrifyingly, they couldn’t stop his son’s legs bleeding so they took him to hospital, where even medical staff weren't able explain the injuries. “As soon as we wiped them [his legs] down, they kept bleeding,” he said.

Sam's legs wouldn't stop bleeding. Source: Jarrod Kanizay via AAP

Source: Jarrod Kanizay via AAP

“There was a massive pool of blood on the floor," Mr Kanizay continued. No one knows what the creatures are. They’ve called a number of people, whether it’s toxicity experts or marine exerts and other medics around Melbourne at least ... yep, no one [knows].”

Stumped by what had attacked his son, Sam's dad went back to the beach the following night with a net full of meat and captured the creatures he said were responsible on film. You can watch the disgusting footage below: