O 2-class submarine

The O 2-class submarine consisted of four submarines built by Koninklijke Maatschappij De Schelde in Flushing for the Royal Netherlands Navy. Used for patrols in the Dutch home waters. The class comprised O 2, O 3, O 4 and O 5. Its diving depth was 25 m; during trials with no crew on board a depth of 40 m was reached.