The structure of SuperHeavy Nuclei (SHN) is analyzed in two microscopic approaches. First one is the Hartree--Fock--Bogolyubov method used with the Gogny force, applied to a large range of nuclei with axial and left--right symmetries. The second one breaks both of these symmetries in mean field. Potential energy surfaces of a few transactinides are studied in this framework. One observes that the fission paths can be strongly modified, leading to significant changes in lifetimes obtained from HFB-D1S.

PACS numbers: 21.30.--x, 21.60.--n, 21.60.Jz, 25.85.Ca