The pilot shaft of the <a href="https://en.wikipedia.org/wiki/Seikan_Tunnel" id="mwAQE" rel="mw:WikiLink" title="Seikan Tunnel">Seikan Tunnel</a>, the world's longest sub-aqueous tunnel (53.85<span id="mwAQI" typeof="mw:Entity"> </span>km) between the Japanese islands of <a class="mw-redirect" href="https://en.wikipedia.org/wiki/Honshū" id="mwAQM" rel="mw:WikiLink" title="Honshū">Honshū</a> and <a class="mw-redirect" href="https://en.wikipedia.org/wiki/Hokkaidō" id="mwAQQ" rel="mw:WikiLink" title="Hokkaidō">Hokkaidō</a>, breaks through.<sup about="#mwt93" 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="./January_27#cite_note-17" id="mwAQU" style="counter-reset: mw-Ref 17;"><span class="mw-reflink-text" id="mwAQY">[17]</span></a></sup>
<span class="mw-reference-text" id="mw-reference-text-cite_note-17"><cite about="#mwt90" class="citation book cs1" id="CITEREFCholachat_RujikiatkamjornBuddhima_IndraratnaProfessor_Jian_Chu2005">Cholachat Rujikiatkamjorn; Buddhima Indraratna; Professor Jian Chu (7 November 2005). <a class="external text" href="https://books.google.com/books?id=_XI7PXtdQMEC&amp;pg=PA354" id="mwB3s" rel="mw:ExtLink nofollow"><i id="mwB3w">Ground Improvement: Case Histories</i></a>. Elsevier. p.<span id="mwB30" typeof="mw:Entity"> </span>354. <a class="mw-redirect" href="./ISBN_(identifier)" id="mwB34" rel="mw:WikiLink" title="ISBN (identifier)">ISBN</a><span id="mwB38" typeof="mw:Entity"> </span><a href="./Special:BookSources/978-0-08-045736-9" id="mwB4A" rel="mw:WikiLink" title="Special:BookSources/978-0-08-045736-9"><bdi id="mwB4E">978-0-08-045736-9</bdi></a>. <a class="external text" href="https://web.archive.org/web/20230924131845/https://books.google.com/books?id=_XI7PXtdQMEC&amp;pg=PA354" id="mwB4I" rel="mw:ExtLink nofollow">Archived</a> from the original on 24 September 2023<span class="reference-accessdate" id="mwB4M">. Retrieved <span class="nowrap" id="mwB4Q">28 January</span> 2019</span>.</cite><span about="#mwt90" class="Z3988" id="mwB4U" title="ctx_ver=Z39.88-2004&amp;rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&amp;rft.genre=book&amp;rft.btitle=Ground+Improvement%3A+Case+Histories&amp;rft.pages=354&amp;rft.pub=Elsevier&amp;rft.date=2005-11-07&amp;rft.isbn=978-0-08-045736-9&amp;rft.au=Cholachat+Rujikiatkamjorn&amp;rft.au=Buddhima+Indraratna&amp;rft.au=Professor+Jian+Chu&amp;rft_id=https%3A%2F%2Fbooks.google.com%2Fbooks%3Fid%3D_XI7PXtdQMEC%26pg%3DPA354&amp;rfr_id=info%3Asid%2Fen.wikipedia.org%3AJanuary+27"></span></span>