A man in his 50s died of an apparent drowning yesterday afternoon while diving at Hanauma Bay, said Bryan Cheplic, city Emergency Services Department spokesman.

The man became separated from his party, and lifeguards found him on the ocean floor near Witch's Brew, a small peninsula and cove on the right side of the popular snorkeling and diving marine sanctuary.

Lifeguards brought the man to shore and performed CPR until city paramedics arrived and took him to a hospital where he was pronounced dead at 12:34 p.m., Cheplic said.