Four people had to be rescued when they got into difficulties off Kilvert Wharf, Grays, on Saturday evening (October 17).
The ambulance service was called to Thurrock Yacht Club at just before 7.10pm, following reports of a capsized 8ft boat out on the water.
A Thurrock rapid response vehicle was on scene in about six minutes, backed up by a Thurrock duty operations manager. Two ambulances were put on standby.
Manager Tony Huggins said: “Four people were rescued by the RNLI and landed at a nearby jetty – three of them had been in the water for half an hour or more.
“All patients were treated for hypothermia, and thoroughly checked over on scene. It was good to see that all of them had lifejackets on, and I would say this was a contributing factor to their survival.”
Following assessment on scene, the group requested to be taken to a home address to recover.
Two of the group, a man and woman, were from the Romford area, and two others were from Thurrock.