Medal commemorating the voyage of the submarine 'K. XVIII'. Obverse: A map of the eastern hemisphere with the eastern part of South America, showing the track of the submarine; below, part of the vessel, midship section. Legend: 'TOCHT Hr. Ms. KXVIII. DEN HELDER - SOERABAIA . 14 NOV 193L TOT 11 JULI 1933.' (Voyage of H.M. K.XVIII from the Helder to Surabaya 14 Nov.1934 to 11 July 1935.) Reverse: Inscription gives a list of the names of the officers: 'COMMAND . D . C . M. HETTER SCHIJ . OFFICIEREN : M . S . WYTEMA C . TER . POORTEN . A . J . MARCUS C V/D . LINDEN . C . B . LEEUWENBURG PROF . Dr. F . A . VENING MEINESZ . EQUIPAGE : J . BOSKAMP . W . C . TEN BERG . J . WEIJDERT . J . KOLDENHOF W . N . KOCH . G . J . STOLK . G . HEIJMEN . K . E . J . WATZ . C . VERSTRATEN . A . BAUW . G . J . VAN . WESTEROP . G . TIMMENS . J . A . HIESTAND . W . A . WAHLERS . J . K . VAL-KIER . W . REITSMA . G . J . A . KONING-STEIN . A . J . VERHOSTE . E . J . VER-MEULEN . A . J . BANNINK . M . TA-WER . L . M . SCHARP . J . WAS-LANDER . P . GOOSSENS F . V/D . LINDE . H . KAR-STANJE.'