  According to theory, cluster radioactivity becomes an important decay mode in
superheavy nuclei. In this work, we predict that the strongly-asymmetric
fission, or cluster emission, is in fact the dominant fission channel for
$^{294}_{118}$Og$_{176}$, which is currently the heaviest synthetic isotope
known. Our theoretical approach incorporates important features of fission
dynamics, including quantum tunneling and stochastic dynamics up to scission.
We show that, despite appreciable differences in static fission properties such
as fission barriers and spontaneous fission lifetimes, the prediction of
cluster radioactivity in $^{294}_{118}$Og$_{176}$ is robust with respect to the
details of calculations, including the choice of energy density functional,
collective inertia, and the strength of the dissipation term.
