The pleasure boat <a href="https://en.wikipedia.org/wiki/Marchioness_disaster" id="mwAUA" rel="mw:WikiLink" title="Marchioness disaster"><i id="mwAUE">Marchioness</i> sinks</a> on the <a href="https://en.wikipedia.org/wiki/River_Thames" id="mwAUI" rel="mw:WikiLink" title="River Thames">River Thames</a> following a collision. Fifty-one people are killed.