Delaunay trIangulation Void findEr (DIVE) identifies all empty spheres that are constrained by four elements of a point set, using the Delaunay Triangulation (DT) technique. In the cosmological context, it is able to resolve all the largest spheres that are empty of tracers, such as galaxies, in either a real survey volume, or a periodic simulation box. These spheres are regarded as a special type of cosmic voids — DT voids — which are allowed to overlap with each other.