The paper reports results of a feasibility study for the development of a multi-purpose submarine which could be applied to a variety of offshore operations sub-ice and in harsh weather areas. The study has jointly been carried out by ThyssenKrupp Marine Systems GmbH and Statoil ASA. Within the scope of the present study, a concept design for a submarine has been derived which can make a significant contribution to the successful development of arctic oil and gas projects. The versatile vessel is designed for several key missions. Installation, inspection, maintenance, and repair tasks for subsea facilities can be performed in water depths up to 1500 m by the use of an on-board gantry crane, an automatic storage system, and two work class ROVs. The boat can also be used to perform seabed seismic surveys at the same water depth. Furthermore the submarine offers unique abilities to respond to sub-ice oil and gas spills. The paper gives an overview of the vessel's layout, capabilities, main systems, safety features, and operational prospects.