JRCC Australia received detections from a Cospas-Sarsat distress beacon.
The EPIRB was detected 22 nautical miles east of the Southport Seaway.
Four people had set off their beacon when a big wave hit their powerboat.
They tread water in their lifejackets as the powerboat sunk beneath them in shark-infested waters.
A rescue helicopter dropped a life raft about twenty minutes after the initial detection of the beacon.
The persons were later transferred onto a rescue vessel and returned to shore for treatment for mild hypothermia.
Read more here:
https://www.9news.com.au/national/2018/05/30/14/42/boat-in-trouble-off-gold-coast