Nuclear systems with two units of strangeness are still poorly known despite their importance for many strong interaction phenomena.
Stored antiprotons beams in the GeV range represent an unparalleled factory for various hyperon-antihyperon pairs. Their
outstanding large production probability in antiproton collisions will open the floodgates for a series of new studies of systems
which contain two or even more units of strangeness. For the first time, high resolution
gamma-spectroscopy of doubly strange nuclei
will be performed, thus complementing measurements of ground state decays of double hypernuclei at J-PARC or possible decays
of particle unstable hypernuclei in heavy ion reactions. High resolution spectroscopy of multistrange Cascade-atoms are feasible and
even the production of
Omega-atoms will be within reach. The latter might open the door to the s=3 world in strangeness nuclear
physics, by the study of the hadronic
Omega-nucleus interaction. For the first time it will be possible to study the behaviour of anti-Cascade in
nuclear systems under well controlled conditions.