Finding a site

No. Archaeologists rarely dig at random. Before breaking ground, they narrow down likely spots using desk research (old maps, historical records, earlier finds) and a field survey, so most excavations follow weeks of investigation rather than a guess about where to put a shovel.

Because soil and sediment pile up over centuries. Wind, floods, decaying plants, and later buildings gradually cover old surfaces, sinking abandoned settlements below ground. That is why archaeologists search for subtle clues, like mounds, dips, or scattered pottery, that hint at what lies beneath.

They use remote sensing. Instruments such as ground-penetrating radar, magnetometers, satellites, and airborne lasers detect buried walls, pits, and structures by reading differences in soil, density, or surface shape, letting archaeologists map a site and decide where to dig without disturbing it.

With marine survey tools. Sonar maps the seabed, magnetometers pick up metal, and divers or small robotic vehicles inspect promising spots. Shipwrecks, sunken harbors, and drowned settlements show up as anomalies on the seafloor, which teams then record much as they would a site on land.