The crew of the <a href="https://en.wikipedia.org/wiki/Soviet_Union" id="mwASU" rel="mw:WikiLink" title="Soviet Union">Soviet</a> <i id="mwASY"><a href="https://en.wikipedia.org/wiki/Soyuz_11" id="mwASc" rel="mw:WikiLink" title="Soyuz 11">Soyuz 11</a></i> spacecraft are killed when their air supply escapes through a faulty valve.<sup about="#mwt102" class="mw-ref reference" data-mw='{"name":"ref","attrs":{},"body":{"id":"mw-reference-text-cite_note-17"}}' id="cite_ref-17" rel="dc:references" typeof="mw:Extension/ref"><a href="./June_30#cite_note-17" id="mwASg" style="counter-reset: mw-Ref 17;"><span class="mw-reflink-text" id="mwASk">[17]</span></a></sup>
<span class="mw-reference-text" id="mw-reference-text-cite_note-17"><cite about="#mwt96" class="citation news cs1" id="CITEREFGwertzman1971">Gwertzman, Bernard (July 2, 1971). "Russians Mourn Soyuz 11 Astronauts". <i id="mwBvU">The New York Times</i>. p.<span id="mwBvY" typeof="mw:Entity"> </span>14</cite><span about="#mwt96" class="Z3988" id="mwBvc" title="ctx_ver=Z39.88-2004&amp;rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&amp;rft.genre=article&amp;rft.jtitle=The+New+York+Times&amp;rft.atitle=Russians+Mourn+Soyuz+11+Astronauts&amp;rft.pages=14&amp;rft.date=1971-07-02&amp;rft.aulast=Gwertzman&amp;rft.aufirst=Bernard&amp;rfr_id=info%3Asid%2Fen.wikipedia.org%3AJune+30"></span>; <link about="#mwt99" data-mw='{"name":"templatestyles","attrs":{"src":"Module:Citation/CS1/styles.css"},"body":{"extsrc":""},"parts":[{"template":{"target":{"wt":"cite news","href":"./Template:Cite_news"},"params":{"last":{"wt":"Teitel"},"first":{"wt":"Amy Shira"},"title":{"wt":"Only Three People Have Died in Space"},"work":{"wt":"Discover Magazine"},"date":{"wt":"August 20, 2017"},"access-date":{"wt":"June 30, 2020"},"url":{"wt":"https://www.discovermagazine.com/the-sciences/only-three-people-have-died-in-space"},"archive-date":{"wt":"July 2, 2020"},"archive-url":{"wt":"https://web.archive.org/web/20200702185300/https://www.discovermagazine.com/the-sciences/only-three-people-have-died-in-space"},"url-status":{"wt":"live"}},"i":0}}]}' href="mw-data:TemplateStyles:r1215172403" id="mwBvg" rel="mw-deduplicated-inline-style" typeof="mw:Extension/templatestyles mw:Transclusion"/><cite about="#mwt99" class="citation news cs1" id="CITEREFTeitel2017">Teitel, Amy Shira (August 20, 2017). <a class="external text" href="https://www.discovermagazine.com/the-sciences/only-three-people-have-died-in-space" id="mwBvk" rel="mw:ExtLink nofollow">"Only Three People Have Died in Space"</a>. <i id="mwBvo">Discover Magazine</i>. <a class="external text" href="https://web.archive.org/web/20200702185300/https://www.discovermagazine.com/the-sciences/only-three-people-have-died-in-space" id="mwBvs" rel="mw:ExtLink nofollow">Archived</a> from the original on July 2, 2020<span class="reference-accessdate" id="mwBvw">. Retrieved <span class="nowrap" id="mwBv0">June 30,</span> 2020</span>.</cite><span about="#mwt99" class="Z3988" id="mwBv4" title="ctx_ver=Z39.88-2004&amp;rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&amp;rft.genre=article&amp;rft.jtitle=Discover+Magazine&amp;rft.atitle=Only+Three+People+Have+Died+in+Space&amp;rft.date=2017-08-20&amp;rft.aulast=Teitel&amp;rft.aufirst=Amy+Shira&amp;rft_id=https%3A%2F%2Fwww.discovermagazine.com%2Fthe-sciences%2Fonly-three-people-have-died-in-space&amp;rfr_id=info%3Asid%2Fen.wikipedia.org%3AJune+30"></span></span>