The RISSC project (https://www.rissc-interreg.eu/) is supported by the European 'Interreg' program which develops social and economic cooperation between European regions. In this framework, Wallonia and Hauts-de-France Regions cooperate to improve risk management related to ground movements due to underground cavities. Due to similar geologic context and industrial history, both territories host similar cavities (natural or anthropic). These cavities induce a potential threat for the population or the infrastructures in terms of ground stability. However, the risk management is different in the two border regions because of distinct national or regional politic strategies. Furthermore, the tools that are used on both sides of the border need to be upgraded. For these reasons, the RISSC project has emerged in order to provide common and better tools for the prevention and the management of cavity-related ground movement issues. Thanks to the cooperative work of several cross-border experts, RISSC achieves concrete results through three main work actions: 1) Inventory of the cavities and the threats, and characterization of the possible consequences at the surface; 2) Development of local solutions to monitor or even reduce the risk; 3) Supply of technical assistance for local actors and population through the creation of useful tools and sources of information. Inventory and characterization Inventories of underground cavities have been established on both sides of the border. Cross-check of these information allows to propose common typology and description of the cavity types. The possible threats they represent need to be assessed, namely through physical data. Several test sites were chosen and works have been conducted on site and in laboratory by actors of the RISSC project. Investigations lead to effective characterization of rock masses. Figure 1 illustrates a geo-mechanical map established on the site of La Malogne quarry (Wallonia). This analysis feeds the numerical models that are developed to assess ...