The NSRI duty crew in Wilderness were activated on Saturday afternoon after a 17-year-old male had reportedly gone missing in the surf, after being swept out by rip-currents
The teenager, from George, was at the beach with his sister when he was swept away.
A bystander went into the surf to try and assist but he was not able to reach the boy in time.
Despite an extensive sea, air and shoreline search, no sign of the teenager has been found.
A police dive unit will continue with an ongoing search operation on Sunday.
Police have opened an investigation and are assisting family of the missing man.