Washington State Route 99
... that Washington State Route 99 passes under downtown Seattle in a tunnel that was excavated by the world's largest tunnel boring machine?
... that <b id="mwhQ"><a href="./Washington_State_Route_99" id="mwhg" rel="mw:WikiLink" title="Washington State Route 99">Washington State Route 99</a></b> passes under downtown <a href="./Seattle" id="mwhw" rel="mw:WikiLink" title="Seattle">Seattle</a> in a tunnel that was excavated by the <a href="./Bertha_(tunnel_boring_machine)" id="mwiA" rel="mw:WikiLink" title="Bertha (tunnel boring machine)">world's largest tunnel boring machine</a>?