The report deals with design conception of a low-frequency emitter with a resonant frequency 20 Hz for use during the Arctic Feasibility Acoustic Propagation Pilot Test (AFAPPT), with the results-of numerical simulating an oscillation system, the calculation of basic parameters of the emitter and its prototype, of acoustic and vibromechanic tests of the prototype, and with the state-of- the-art of arranging the production and fabrication of the Arctic Source. The suggested design of the Arctic Source is the result of more than ten-year experience of the development and operation of efficient low-frequency emitters in exploration of remote acoustic methods of the ocean diagnostics. During this period there were developed theoretical models of monopole emitters with spaced elastic elements used as the main oscillating or radiating surfaces. A large number of materials (different grade steels, titanium and aluminium - bearing alloys of different qualities) have been investigated under various conditions of hot working and machining, the resistance of these materials to alternating dynamic loads have been determined experimentally. The fatigue curves have been recorded enabling one to predict the permissible number of the emitter operating cycles in sea water.