Over 640 die when the crowded pleasure boat <a about="#mwt31" data-mw='{"parts":[{"template":{"target":{"wt":"SS","href":"./Template:SS"},"params":{"1":{"wt":"Princess Alice"},"2":{"wt":"1865"},"3":{"wt":"2"}},"i":0}}]}' href="https://en.wikipedia.org/wiki/Sinking_of_SS_Princess_Alice" id="mwpQ" rel="mw:WikiLink" title="Sinking of SS Princess Alice" typeof="mw:Transclusion"><i>Princess Alice</i></a> collides with the <i id="mwpg"><a href="https://en.wikipedia.org/wiki/Bywell_Castle" id="mwpw" rel="mw:WikiLink" title="Bywell Castle">Bywell Castle</a></i> in the <a href="https://en.wikipedia.org/wiki/River_Thames" id="mwqA" rel="mw:WikiLink" title="River Thames">River Thames</a>.