A <a class="mw-redirect" href="https://en.wikipedia.org/wiki/B-52" id="mw1w" rel="mw:WikiLink" title="B-52">B-52</a> bomber <a href="https://en.wikipedia.org/wiki/1968_Thule_Air_Base_B-52_crash" id="mw2A" rel="mw:WikiLink" title="1968 Thule Air Base B-52 crash">crashes</a> near <a class="mw-redirect" href="https://en.wikipedia.org/wiki/Thule_Air_Base" id="mw2Q" rel="mw:WikiLink" title="Thule Air Base">Thule Air Base</a>, contaminating the area after its nuclear payload ruptures. One of the four bombs remains unaccounted for after the cleanup operation is complete.