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I'm sure this won't work in my case is we will be over bodies of water that is flowing to the ocean and ground water which is encountered throughout the site. I have seen those magic wands work before and am still amazed by it.

Thanks for your time Richard. After reading up on the previous options we had I figured it'd be impossible. We've come up with an option to only detect the tunnel under bridge crossings. We will install a tracer line under the road so the tunnel will be easily detectable.

Thanks, guys! These are all great comments and thanks for the leads. I'll be reading up more on these. Unfortunately I won't be able to make it to that trade show in KY.

The pipe material will either be reinforced concrete or a polymer concrete jacking pipe with a CCFRPM (centrifugally cast fiberglass reinforced polymer mortar) pipe installed inside the jacking pipe. The ground conditions will be mostly clay and basalt rock with ground water encountered throughout.

Hello all, The concept of deep tunneling is new to me and have a question regarding detection of the pipe after construction. Right now i'm designing a deep (-45 to -50 feet deep) sewer collection system which will be under bodies of water and land. My question is: after the sewer pipe is...