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Invisible Features

Geophysics does not always locate buried features.

Here is part of a site where a sewer manhole is in the field but the, (presumably concrete), drains leading to and from it are not detectable by magnetometry.

We know that it is a sewer as it was leaking - hence the unsurveyed pool area to its south.

Magnetometry near concrete drain

Magnetometry survey locating probable Roman remains but not detecting a modern drain.