PlaySwimmers in Australia have had a close encounter with a couple of sharks.
About 700 people were competing in a Surf Lifesaving race off the Sydney coast when the pair were spotted.
Lifeboats chased the hammerhead in an effort to force it out to sea.
It's thought the smaller shark swam directly beneath those competing - but it eventually swam away.
Most of the swimmers remained happily oblivious to their presence.
Except for race winner Chris Allan - but he didn't seem put off: "I was swimming along and a couple of guys in the RB put up the shark signal, I figure they had 700 of us to choose from and they couldn't decide by the looks of things."
The sighting follows three shark attacks in Sydney waters over the past few weeks.
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