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Sabina GriffithIf you ever wondered what's the reason for the siren that you hear every Thursday at 13h00, here is the answer: it is a test for the general alert of the CEA Centre that starts with an intermittent sound and ends with a continuous alarm. So, what should you do in case of an emergency? First of all, stay in the building you are in or enter the nearest building around; close all windows and doors and follow further instructions given through the loudspeakers; if required, take out the emergency mask and suit provided at the entrance of each building and put them on; if there are newcomers or visitors around, take care of them; use the telephone only for safety purposes.