A 55-year-old man is in critical condition after being found unresponsive in waters off of the Waianae coast this morning.

Honolulu Ocean Safety got a call at about 11:15 a.m. today for the man, who was reported to be unresponsive aboard a tour boat operating offshore of Waianae High School.

Lifeguards headed out to the boat on rescue watercraft, and immediately began CPR upon boarding.

The boat headed back to a dock, where care was transferred to Honolulu Emergency Medical Services.

Paramedics took over with advanced life support, and transported the man to an emergency room in critical condition.