Honolulu Ocean Safety rescued 16 people and took about 2,000 preventative actions during Friday’s south swell, which resulted in a high surf warning for the south shores of all islands.

The warning was later downgraded to an advisory Saturday morning.

Ocean Safety, Honolulu Emergency Medical Services, Hale Koa pool lifeguards and the American Medical Response, with the help of bystanders, responded to two unresponsive swimmers off of Fort DeRussy just after 4:30 p.m. Friday, according to EMS.

The two patients — a man, 60, and a woman, 59 — were brought to shore by bystanders. Cardio pulmonary resuscitation was performed on the woman, while the man needed advanced medical treatment, EMS said. Both patients were taken to an emergency room, with the woman in critical condition and the man in serious condition.

EMS is advising the public to “use extreme caution during this time,” as surf remains high through Saturday.