Artur Grządziel - Commander of hydrographic ship ORP “Arctowski”, since 1998. related to hydrography, marine measurements and study shipwrecks, ships and aircraft. He completed postgraduate studies at the Naval Academy and the international hydrographers course in NAVOCEANO Gulfport (USA). He is class “A” Hydrographer, member of the Polish Association of Marine Hydrographers and the author of several articles on the field of marine hydrography. He is interested in sonar technology, bathymetric systems and other measurement equipment used for exploration and investigation of wrecks.