Jouke Spoelstra (1957) joined the Netherlands Navy in 1979 as a midshipman at the Royal Naval Collega in Den Helder. After his promotion to officer he served most of his active career on submarines or in submarine related posts in the Netherlands Navy. Since 2007, as a side job he has been a member of the Work Group Submarines, established to find the wrecks of the still lost Dutch submarines HNLMS K XVI (lost in the South China Sea) and HNLMS O13 (lost in the North Sea). In this Group he was appointed Project Leader for the search of O13. In the last years he has been involved in the identification of about 10 submarine wrecks on the Dutch Continental Shelf. The search for O13 goes on!