Townsend Thoresen's Herald of Free Enterprise car ferry capsized moments after she left the Zeebrugge harbour - killing 193 passengers and crew.
The roll-on roll-off ferry, designed for rapid loading and unloading, left port with her bow door open - allowing seawater to flood onto the car decks and tip the vessel over.
The disaster led to major changes to the design and safety procedures of cross-channel car ferries.
Report by Guinnesse.
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