secret underground rocket base
... that the Second World War Allies feared that Nazi Germany intended to use a secret underground rocket base in France to fire ballistic missiles at New York City?
... that the <a href="./Allies_of_World_War_II" id="mwAUM" rel="mw:WikiLink" title="Allies of World War II">Second World War Allies</a> feared that <a href="./Nazi_Germany" id="mwAUQ" rel="mw:WikiLink" title="Nazi Germany">Nazi Germany</a> intended to use a <b id="mwAUU"><a href="./La_Coupole" id="mwAUY" rel="mw:WikiLink" title="La Coupole">secret underground rocket base</a></b> in France to fire ballistic missiles <i id="mwAUc">(<a class="mw-redirect" href="./V-2" id="mwAUg" rel="mw:WikiLink" title="V-2">V-2</a> pictured)</i> at New York City?