The volunteer crew launched their inshore lifeboat Hannahbella Ferguson following a request by Belfast Coastguard at 10.35pm to go to the assistance of a person who was spotted lying face down in the sea within 200 metres from the shore in Larne Lough.
Weather conditions at the time were good with a flat calm sea but light was fading.
The lifeboat - helmed by Willie Evans and with crew members Dave Somerville and Pamela Dorman onboard - arrived on scene at 10.41pm and pulled the casualty on to the lifeboat. With the man not breathing, two crew members proceeded to perform CPR and resuscitated the casualty.
The helm brought the lifeboat into a small slipway along the promenade which was accessible due to a high tide. The casualty was subsequently handed over to the waiting paramedics and ambulance.
Speaking after the call-out, Larne RNLI helm Willie Evans praised the crew who he said had worked together to resuscitate the casualty and bring him to shore.