Pompeii was discovered by a man named Domenico Fontana (1543-1607) by accident in 1599 when he was working on a hydraulics project. Archaeologists did not dig up the site till about 1748.
When it was dug up it looked almost exactly the same as it did around 2000 years ago.
The tools that they used were: Hoes, corers, plumb bob, mattock, spade, shovel, side-scan sonar, metal detectors, magnetometers, ground-penetrating radar wavelengths, microscopes, paintbrushes, mass-spectrometers, string, ladders, and also some surveying equipment.
Domenico Fontana