Secrets of high-tech tunnels in The world

<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEj_w4cX3tKeQRSLJ4a5uOmK-t6drenrQO4QJnrnZQoZOkczVbmcgOikng_rd5O0f_9QeJSdzsAqs9vA5trZ2qSZnik9wTuRd6b3myuUTWdQ9diXHpQRsgmC28K6-w4KJDFTa6Dn0qW7j-s/s1600/200613gencitilink03_18s6vca-18s6vcd.jpg" imageanchor="1" style="clear: right; float: right; margin-bottom: 1em; margin-left: 1em;"><img border="0" height="192" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEj_w4cX3tKeQRSLJ4a5uOmK-t6drenrQO4QJnrnZQoZOkczVbmcgOikng_rd5O0f_9QeJSdzsAqs9vA5trZ2qSZnik9wTuRd6b3myuUTWdQ9diXHpQRsgmC28K6-w4KJDFTa6Dn0qW7j-s/s1600/200613gencitilink03_18s6vca-18s6vcd.jpg" width="320"></a>The Australian-first use of latest electrical technology has allowed the new Fremantle line tunnel to be engineered simply one.2m on top of the present Joondalup line tunnel.<br>

Secrets of high-tech tunnels in The world

The Australian-first use of latest electrical technology has allowed the new Fremantle line tunnel to be engineered simply one.2m on top of ...

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