Tadeusz Kantor’s “Panoramic Sea Happening” was one of the most important and most talked artistic events in Poland in the late 60’s. In this article I discuss participation of Maria Pinińska-Bereś in this happening. So far, outside the relation of the artist, objective evidences of it were not known. Her participation has been effectively silenced by Kantor and consequently erased from the collective memory. The article finally resolve the issue of the participation of Maria Pinińska-Bereś on Kantor's happening. I try to reconstruct the atmosphere of the event and motives of Kantor.