Metal detector detects something on field where house is planned to be

last year

Hello. I have a situation. I have a house project, its done. Just for fun, I have two metal detectors, and both of them picks up signal at field which is 10x12m large, like there is a large metal plate under it, on every inch it shows something, there are no electric lines, that would be seen in land schematics by architect etc. What could make that?

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