A visitor was in serious condition Saturday after swallowing water while snorkeling by the Mokulua islets off Lanikai, according to Honolulu Emergency Services Department spokeswoman Shayne Enright.

The 58-year-old man was brought to shore shortly after 1 p.m. An Emergency Medical Services crew took over with advanced life-saving measures and transported the man to an emergency room, she said.

Shortly after that report, a 28-foot vessel was reported adrift off Kaena Point with four divers aboard.

A fifth diver on shore called 911 at about 1:30 p.m. Personnel from the department’s Ocean Safety and Lifeguard Services Division found all four divers and brought them to shore safely, Enright said.