  The production of doubly strange hyperon $\Xi^-$ and trebly strange hyperon
$\Omega^-$ in relativistic Au+Au collisions at $\sqrt{s_{NN}}$ = 4.2 GeV is
explored based on a relativistic transport model that is interweaved with
hadronic mean-field potentials for heavy-ion collisions. Upon comparison, it
appears that relative to the double strangeness observable $\Xi^-$, the yield
and collective flows of the triple strange $\Omega^-$ exhibit a higher
sensitivity to the equation of state (EoS) of dense matter. This characteristic
makes the $\Omega^-$ an essential observable for studying the properties of
densely formed matter in relativistic heavy-ion collisions.
