A man on a snorkeling tour off Oahu has died, a grim reminder of how quickly ocean outings can turn fatal.

• The man was snorkeling with a tour group offshore of Kahe Point when he was pulled from the water unresponsive.
• The boat crew started CPR and rushed him to Ko Olina.
• He was later pronounced dead at a nearby hospital, Honolulu police said.
• Snorkeling remains one of the deadliest activities for visitors in Hawaii waters.

Outlook: Police are expected to confirm the cause of death, and tour operators will likely face renewed scrutiny over swimmer safety checks.