[en] This publication deals with results of a series of containment thermalhydraulic and aerosol studies made with the multicompartment code system CONTAIN 1.12 for the VANAM experiment M3. This work was done as a participation to the open ISP37. VANAM M3 was planned to give experimental data for verification of aerosol computer codes and test their thermohydraulic and aerosol results on such a large integral multicompartment containment experiment. Five different calculations are compared in this paper. The influence of simplifications was studied for example by - taking only oxygen instead of air as atmospheric gas - modeling the outer structures only by concrete - using flow coefficients according to Idel'chick or improved values -including radiation transport effects. CONTAIN thermohydraulic results are within the accuracy that can be obtained regarding the uncertainties of the experiment and the the boundary conditions used as code input. CONTAIN is able to simulate atmospheric stratifications as observed in the experiment. VANAM M3 used water soluble NaOH aerosol to study a 'dry' aerosol depletion phase and later after a second aerosol injection the behaviour in a 'wet' surrounding. The aerosol densities differ by more than an order of magnitude in the different compartments. To calculate this behaviour a multicell code like CONTAIN with its powerful MAEROS tool for the hygroscopic aerosol treatment was needed. The aerosol transport to different cells and the aerosol densities in these rooms are calculated qualitatively correct with CONTAIN 1.12. (orig.)