Core drilling, which is a more advanced form of mechanical drilling, is particularly useful in identifying the geology of the ground for the construction of future roads, airports and when there is a need to take samples with an intact structure. Cored drilling is also recommended when examining landslides and in the GDDKiA guidelines for examining roads. This type of drilling allows for continuous observation of an intact soil profile. Cored drilling is used in engineering geology and hydrogeology.