The Steering committee is assisted in its activities by two advisory committees, a scientific committee SAC (Scientific Advisory Committee) and a committee for programming underground experiments, POP (Programme Committee for Underground Experiments), and by a safety coordinator, responsible for the safety policy.

The SAC comprises scientists from various universities and members from the international Radwaste Management community:

• Dr Hans-Joachim Alheid, Scientific Director, BGR (DE)
• Prof. Robert Charlier, GeomaC, ULg (BE)
• Prof. Véronique Halloin, Service Génie Chimique, Fac. Sciences Appliquées, ULB (BE)
• Prof. Noel Vandenberghe, Historische Geologie, K.U.Leuven (BE)
• Prof. Geert De Schutter, Labo Magnel, Ugent (BE)
• Dr Piet Zuidema, Division Head, NAGRA (CH)