International Tunnelling and Underground Space Association’s Committee (ITACUS) sees ISOCARP’s YPP programme as an ideal example of how to actively involve ITA Young Members and make them part of a cross-disciplinary cooperation with ISOCARP Young Planners. It ties in directly with the co-operation the ITA Young Members are seeking with the ITA committees and more specifically, to the new ITACUS joint activity group on a programme for young members. ITACUS is therefore now actively setting up of a Young Professional’s Think Deep Programme for young members (YPTDP), working together with ISOCARP. The core idea is to combine the proven methodology of ISOCARP’s YPPP with the concept of working cross-disciplinarily on underground planning issues. The results of the foreseen five YPTDP case studies will be collated into a follow-up publication to Think Deep and presented at the ITA WTC, ISOCARP World Congresses and the ACUUS World Congress.