British submarine <a about="#mwt53" data-mw='{"parts":[{"template":{"target":{"wt":"HMS","href":"./Template:HMS"},"params":{"1":{"wt":"Truculent"},"2":{"wt":"P315"},"3":{"wt":"6"}},"i":0}}]}' href="https://en.wikipedia.org/wiki/HMS_Truculent_(P315)" id="mwxw" rel="mw:WikiLink" title="HMS Truculent (P315)" typeof="mw:Transclusion">HMS<span typeof="mw:Entity"> </span><i>Truculent</i></a> collides with an oil tanker in the <a href="https://en.wikipedia.org/wiki/Thames_Estuary" id="mwyA" rel="mw:WikiLink" title="Thames Estuary">Thames Estuary</a>, killing 64 men.