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One person had died and three others were injured when a catamaran capsized off Schkulphoek near Hermanus in the Western Cape.
NSRI spokesperson, Craig Lambinon, says volunteers from NSRI Hermanus were called in to action Tuesday afternoon following reports of red distress flares being fired from a boat.
He says the SA Police Services, Western Cape Health Emergency Medical Service, EMR private ambulance service and the Overberg Fire and Rescue Services responded.
Lambinon says on arrival on scene they found that a catamaran ski-boat with 4 people from Pretoria on board, had capsized 150 meters off-shore while returning from cray-fishing.
He says a member of the public had waded into the surf to secure the body of a 29 year old male for fear that the body, which was floating near to rocks would be swept out to sea.
Three people, aged 47, 19 and 12, survived but suffered fractured ribs, lacerations, bruising and shock.
Lambinon says it appears that the boat have been running close to shore when it capsized in swells and washed onto rocks.
Meanwhile, Tuesday's accident was one of three boating incidents reported by the NSRI in different parts of the country in the past few days.
On Saturday a woman was seriously injured when two boats collided on the Kromme River at St Francis Bay in the Eastern Cape.
The accident is being investigated by the SA Maritime Safety Authority.
Earlier, we reported on the dramatic deep sea rescue of a Benoni man who lost control of his yacht during a solo mission to St Helena.
Forty-seven-year-old Michael Kuun is back on terra-firma after a harrowing ordeal which saw him end up in the water in the mid Atlantic before he was rescued by a passing oil tanker.
The full NSRI report on Kuun's ordeal is available to read elsewhere on our website.