First of all, there is risks involved with tunnelling. Let's not...

First of all, there is risks involved with tunnelling.

Let's not make silly assumptions and rather make educated assumptions. Heres a list;

-The land had been extensively inspected & core samples had been taken at current depths to ensure what lie ahead for Sandy & Grace are not entirely unknown.

-It appears all involved knew there were challenges which lie ahead;

(The Ascot Formation, through which the TBMs were tunnelling when disturbance occurred, comprises non-cohesive granular material that makes tunnelling more complex.

When the contract for the project was signed all parties involved were well informed about the potential challenges involved in tunnelling.)

-Persons involved with this project are at an elite level with experience around the world.

And lastly lets not take away from JP;
I'm certain the NRW team had the contract ran over with a very fine toothed comb to ensure if something were wrong with the land formations, that we would have an eject button.

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Any questions you think you may have please check here;

http://www.forrestfieldairportlink....es#How-are-you-going-to-manage-this-issue-150

Moving on...

Keep safe this easter everyone.