Honolulu Fire Department and Honolulu Ocean Safety officials responded to a 61-year-old woman in distress while swimming at a North Shore beach around 10:45 a.m. today.

A good Samaritan jumped into the ocean at Three Tables Beach to save the woman and brought her onto rocks to administer CPR, Honolulu Emergency Services Department’s Shayne Enright said in an email.

Lifeguards on watercraft carried the woman on board and later to shore to continue CPR. Paramedics took over to administer advanced life-saving treatment.

Paramedics transported the woman to a nearby hospital in critical condition.

Surf was said to be 6 feet high, Enright said.

Four others were shaken but uninjured today after escaping potentially deadly ocean conditions in a pair of separate incidents also at Three Tables.

Around 1:30 p.m., lifeguards rescued three men in their mid-30s from the water.

A couple of hours later, another man, believed to be in his 20s, got into trouble at the same spot but was able to return to shore on his own.

Ocean Safety officials said there traditionally is an uptick in rescues at Three Tables and nearby Sharks Cove this time of year, in part because while surf may appear small, winter surf and strong currents can create dangerous situations.

Neither location has lifeguards on duty, although both have multiple warning signs alerting the public to dangerous conditions. The public is advised not to enter the water in areas where there are not lifeguards to consult about conditions.