Courageous class battlecruiser
... that the British Courageous class battlecruiser HMS Courageous was damaged when her forecastle deck buckled during her sea trials while running at full speed in a rough head sea?
... that the British <b id="mwDVw"><a class="mw-redirect" href="./Courageous_class_battlecruiser" id="mwDV0" rel="mw:WikiLink" title="Courageous class battlecruiser"><i id="mwDV4">Courageous</i> class battlecruiser</a></b> <a about="#mwt46" data-mw='{"parts":[{"template":{"target":{"wt":"HMS","href":"./Template:HMS"},"params":{"1":{"wt":"Courageous"},"2":{"wt":"50"},"3":{"wt":"6"}},"i":0}}]}' href="./HMS_Courageous_(50)" id="mwDV8" rel="mw:WikiLink" title="HMS Courageous (50)" typeof="mw:Transclusion">HMS<span typeof="mw:Entity"> </span><i>Courageous</i></a> <i id="mwDWA">(pictured after aircraft carrier conversion)</i> was damaged when her <a href="./Forecastle" id="mwDWE" rel="mw:WikiLink" title="Forecastle">forecastle</a> deck buckled during her <a href="./Sea_trial" id="mwDWI" rel="mw:WikiLink" title="Sea trial">sea trials</a> while running at full speed in a rough head sea?