SYDNEY, Aug. 7 -- A teenager from the city of Melbourne in Australia remained in hospital on Monday, after being mauled by mysterious sea creatures when going for a swim at the beach over the weekend.

Sixteen-year-old Sam Kanizay had played a game of football on Saturday and afterward decided to take a dip at a beach in the popular tourist location of Brighton in Melbourne when after half an hour in the water, trouble struck.

When Kanizay emerged from the water, he thought he still had sand on his legs, so he went back in, only to continue to be attacked by tiny little sea creatures, according to his father, Jarrod Kanizay, who told local media his son started bleeding profusely when he got out of the water the second time.

"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," Kanizay said.

After taking his son to the hospital, the senior Kanizay said that despite the initial treatment, his son continued to be affected by whatever it was that was attacking his legs.

"As soon as we wiped them down, they kept bleeding, there was a massive pool of blood on the floor," Kanizay said.

 "No one knows what the creatures are. They've called a number of people, whether it's toxicity experts or marine experts, and other medics around Melbourne at least -- no one (knows)."

This uncertainty prompted the concerned father to return to the beach armed with fresh meat and a wet suit, and he captured some of the creatures, with some speculating that they are in fact a variety of sea lice.

Until a determination can be made as to the cause of the injuries, local authorities are unable to act upon the matter. Xinhua