  Based on the relativistic calculations of the nuclear masses in the
transfermium region from No $(Z=102)$ to Ds $(Z=110)$ by the deformed
relativistic Hartree-Bogoliubov theory in continuum, the possible existence of
the bound nuclei beyond the neutron drip lines is studied. The two-neutron and
multi-neutron emission bound nuclei beyond the primary neutron drip line of
$N=258$ are predicted in $Z=106,108$ and $110$ isotopes. Detailed microscopic
mechanism investigation reveals that nuclear deformation plays a vital role in
the existence of the bound nuclei beyond the drip line. Furthermore, not only
the quadrupole deformation $\beta_{2}$, but also the higher orders of
deformation are indispensible in the reliable description of the phenomenon of
the reentrant binding.
