This picture shows the salvaging of English submarine HMS E13. It had been sent out from Harwich to support the Russian fleet in the North Sea in an attempt to foil German trade with the Scandinavian countries. On the evening of 18 August 1915, HMS E13 ran aground off the island of Saltholm in the strait of Øresund because of problems with its compass. The shallow waters of Øresund were mined during the war, which made it a difficult strait to navigate.
The next morning, the Danish coast guard detected the UK submarine. Because of all the activity, German ships nearby caught sight of it and went in to attack, killing 15 onboard. This caused a huge stir in both Denmark and Britain, because of the breach of international law whereby ships were forbidden to open fire in Denmark’s neutral waters.