An autonomously profiling moored installation was successfully completed at 3,700 meters deep in the subarctic waters of the Greenland Sea to offer conductivity temperature, depth (CTD) measurements between the deepsea ocean bottom and the surface for an entire year in the summer of 2008. The profiling installation was divided into two parts: one moving between the ocean bottom and a nominal depth of about 100 meters and a second covering the upper part between about 160 meters and the surface. The Externally Powered/Compressibility Compensated (EP/CC)-Yoyo was designed by the Alfred Wegener Institute. The combination of the CTD and flotation had a nominal buoyancy of 80 newtons to overcome the friction imposed on it by wave action, and six 24-volt battery pressure cases with a total of 300 ampere-hours supplied the energy necessary for daily profiles over the one-year deployment.