Home > Years > 1851 1851 Shark attacks in 1851. Browse 3 documented incidents. 3 Total Incidents 2 Fatal Attacks All Incidents 🔴 Fatal Swimming Attack - 1851 📍 Honolulu Harbor, Hawaii, USA 🟡 Non-fatal Diving Attack - 1851 📍 San Francisco Bay (or San Leandro Bay), near cannery, Alameda County, California, USA 🔴 Fatal Attack - 1851 📍 Tehuantepec Harbor, Oaxaca, MEXICO