An elderly man has been confirmed as the first known fatality after a boat sank in San Francisco Bay, while three other passengers remained missing almost 24 hours later. The incident matters because it had shifted from an immediate rescue effort into a prolonged search, highlighting the human toll of the sinking and the uncertainty still facing the missing passengers' families.

The victim was identified as Clifford Boisa, according to the report, and the accident left at least four people unaccounted for in total. The key facts are that the vessel went down in San Francisco Bay, one death had been officially confirmed, and search efforts were still continuing nearly a day after the sinking. The article centres on the developing status of the emergency rather than a full explanation of what caused the boat to go down.