1967 Lake Erie skydiving disaster
On August 27, 1967, eighteen skydivers mistakenly parachuted into Lake Erie, four or five nautical miles (7.5–9.3 km) from Huron, Ohio, United States, after jumping from a civilian North American B-25 Mitchell. Sixteen drowned.
Source: Wikipedia — 1967 Lake Erie skydiving disaster (CC BY-SA 4.0)