A top-heavy ship killed more people than the Titanic, tied to the dock

On 24 July 1915, the SS Eastland rolled over in the Chicago River, in about 20 feet of water, just yards from shore, with roughly 2,500 passengers aboard. 844 people died — more than died on the Titanic — in Chicago's deadliest single disaster.

— Wikipedia, SS Eastland — 24 July 1915