Emergency services were called to Little Bay Beach at 1.10pm after a man was seen struggling in the water.

A police helicopter, members of Surf Life Saving NSW, NSW Ambulance paramedics and Randwick Council lifeguards are involved in the search.

Police are urging anyone with information about the whereabouts of the man to call Eastern Beaches Police or Crime Stoppers on 1800 333 000.

Meanwhile, two people have died as monster swell batters parts of the NSW coastline.

A person, who is yet to be formally identified, drowned off Middle Head in Mosman on Sydney’s lower north shore after 10am.

Meanwhile, a 58-year-old fisherman died after being swept into the water in Wollongong Harbour in the NSW Illawarra region about 6am.

Police believe the man was fishing on a rock wall nearby when he was swept into the water.

He was pulled from the water but could not be revived.

A deep low pressure system in the Tasman Sea is generating large and powerful surf and swell across the New South Wales coast, according to the Bureau of Meteorology.

“This low pressure system is very powerful, although it’s a long way offshore. This low will not impact our weather directly but will generate some very large, powerful waves for eastern Australia,” senior Meteorologist Angus Hines said.

“These waves will build on Thursday and stay high until Saturday.

“Coastal hazard and hazardous surf warnings are likely to be issued.

“Given the fine and hot forecast for the east coast during Friday and Saturday, the community needs to be aware of the dangerous coastal conditions.”

Emergency services have warned beachgoers to put safety first over the Easter long weekend.

“Large and powerful surf conditions are expected to be hazardous for coastal activities such as crossing bars by boat and rock fishing,” NSW Police said on social media.

“If on the water in general a reminder to wear a lifejacket and have all safety equipment.

“Check local weather and if in doubt don’t go.”