Submarine Telegraph Company
... that the opening of the Submarine Telegraph Company's first oceanic telegraph cable was marked by remotely firing a cannon in Calais from a telegraph station in Dover?
... that the opening of the <b id="mwAhs"><a href="./Submarine_Telegraph_Company" id="mwAhw" rel="mw:WikiLink" title="Submarine Telegraph Company">Submarine Telegraph Company</a></b><span about="#mwt34" class="nowrap" data-mw='{"parts":[{"template":{"target":{"wt":"`s","href":"./Template:`s"},"params":{},"i":0}}]}' id="mwAh0" typeof="mw:Transclusion"><span typeof="mw:Entity">'</span>s</span> first oceanic <a class="mw-redirect" href="./Telegraph" id="mwAh4" rel="mw:WikiLink" title="Telegraph">telegraph</a> cable was marked by remotely firing a cannon in <a href="./Calais" id="mwAh8" rel="mw:WikiLink" title="Calais">Calais</a> from a telegraph station in <a href="./Dover" id="mwAiA" rel="mw:WikiLink" title="Dover">Dover</a>?