Abstract: Post-crisis analysis of transboundary crises in Sweden is problematic due to limited documentation. We believe that there is a need to find tools to better understand the command and control, and to understand how the information sharing that takes place during larger crises works. This paper presents the results of an ongoing research, as well as findings about how the TETRA system is used for information sharing in transboundary crises. The data used was collected from two large emergency exercises, where Swedish, Finnish and Norwegian TETRA systems were merged. Communication in 10 shared talk groups was recorded, transcribed and analyzed. The communication in shared TETRA-talk-groups mostly focused on information about the accident, the recourses and first respond units, as well as the actions of each unit. The research also exemplifies and shows that communication within TETRA-talk-groups in transboundary crisis can give new insight into how command and control works.