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Before construction can begin on a proposed building site, archaeologists are sometimes called in to conduct a survey, particularly in regions with a long history of settlement. Rather than digging at random, teams typically start with non-invasive methods such as ground-penetrating radar, which can reveal disturbances in soil layers without disturbing the site itself. Only after these initial surveys suggest the presence of artifacts or structures do crews begin careful excavation, working in small grids to record the exact position of each item found. This methodical approach matters because the location of an object relative to surrounding soil layers can reveal as much about its age and purpose as the object itself, and careless digging can destroy that contextual evidence permanently.