The Hermanus National Sea Rescue Institute crew were activated at 11.30pm on Tuesday, said spokesman Craig Lambinon.
“NSRI Hermanus volunteer sea rescue duty crew launched the sea rescue craft South Star and responded,” he said.
The rubber-duck, with recreational scuba divers on board, had experienced motor failure.
“All 11 men, from Masakhane, Gansbaai, were brought ashore safely by NSRI Hermanus without incident and no one was injured.”
The operation was completed at 5.30am on Wednesday.