A Soviet <a href="https://en.wikipedia.org/wiki/Zulu-class_submarine" id="mwhw" rel="mw:WikiLink" title="Zulu-class submarine">Zulu-class submarine</a> becomes the first to launch a <a href="https://en.wikipedia.org/wiki/R-11_Zemlya" id="mwiA" rel="mw:WikiLink" title="R-11 Zemlya">ballistic missile</a>.