As part of the PHC-Polonium between MIO and IOPAN (The Institute of Oceanology of the Polish Academy of Sciences), the first sampling mission around the wreck of the Franken, a German supply ship sunk in 1945, took place from 3 to 6 November. On board the Oceania were the IOPAN team and the MIO team, Stéphane Mounier and Benjamin Oursel (CEM). On the programme were profiles using the mini-fluo, prepared by Najib Bhairy (MIO-SAM) and Marc Tedetti (MIO-CEM), and water samples to correlate the fluorescence signal and PAH content. The wreck is likely to spread these contaminants into the Bay of Gdansk and direct measurement would be a plus for monitoring this spot. Due to the confinement, it has not been possible to measure PAHs by GC-MS, but this is only a temporary solution.