The laboratory performs research in a close co-operation with the Paul Scherrer Institute (PSI) in the field of single- and multi-phase flows in nuclear power installations. Beside applied topics, studies of fundamental thermal fluid-dynamic phenomena are part of the research activities. New test facilities are planned, which will be equipped with high-resolution two-phase instrumentation. The in-house development of novel measuring techniques is an important issue. Large-scale experiments are performed at the PANDA containment test facility of the Laboratory of Thermohydraulics in PSI. The experiments aid developing and validating codes for three-dimensional computational modelling (CFD).