UPDATE: THE body of a man, who went missing during a swim in the Hawkesbury River, has reportedly been found.
Police divers joined a large-scale search for the 18-year-old, who failed to return after going swimming from a house boat northwest of Sydney around 8.30 Friday night.
Concerned family members contacted Hawkesbury police, who commenced a search, with the assistance of State Emergency Services (SES), Marine Area Command (MAC), NSW Marine Rescue, and air Ambulance.
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But the man was not found during the initial search and authorities continued to look for him overnight.
A larger-scale search began at first light this morning.