On 30.November 1939 sunk on mine british steam ship "Sheaf Crest"(2.730 BRT).
On 27.November 1939 sunk on mine Dutch steam ship "Spaarndam"(8.897 BRT).
On 18.November 1939 sunk on mine Dutch steam ship "Simon Bolivar"(8.309 BRT).
On some day sunk on mine british steam ship "Blackhill"(2.492 BRT). Do you know her cargoes/routes?