An item reported that the Monday before the Dutch submarine Luctor et Emergo (1) performed some excellent diving tests in the harbour of Flushing. She was manned by Dutchmen commanded by lieutenant Koster. The tests were attended by the German army ober leutnant Scheffer.
Note
1. Commissioned as her first submarine in the Royal Netherlands Navy as the O1. See further the link http://warshipsresearch.blogspot.nl/2012/12/dutch-skilled-craftsmen-of-dutch.html
