tunnels
...that 16 tunnels, many for tube lines, run beneath London's River Thames?
...that 16 <b id="mwkw"><a href="./Tunnels_underneath_the_River_Thames" id="mwlA" rel="mw:WikiLink" title="Tunnels underneath the River Thames">tunnels</a></b>, many for <a href="./London_Underground" id="mwlQ" rel="mw:WikiLink" title="London Underground">tube</a> lines, run beneath <a href="./London" id="mwlg" rel="mw:WikiLink" title="London">London</a>'s <a href="./River_Thames" id="mwlw" rel="mw:WikiLink" title="River Thames">River Thames</a>?