An underwater test field in the Baltic Sea - the "Digital Ocean Lab" (DOL) - will provide research and industry with realistic testing opportunities for new underwater technologies. Starting from an artificial reef off Nienhagen, several test areas for different scenarios are being created under the direction of Fraunhofer IGD. The "Ocean Technology Campus" is being built around the land-based control center of the new underwater test field in collaboration with Fraunhofer IGD, the Subsea Monitoring Network e.V. and Rostock Business. On the site of Rostock's cargo and fishing port, it will create a productive environment in which marine technology can be developed and tested in close cooperation between research from various disciplines and industry. Successful technology transfer should be even more successful thanks to the close proximity, leading to faster and more successful innovations and helping Rostock to play a leading role on the international technology markets.