Dutch subs sank at least three: O-21 sank U-95 near Gibraltar, Zwaardvisch sank U-168 in the Java Sea and Dolfijn (?) sank an Italian sub (Malachite?), the last is from memory so I have to check to confirm this one. In the case of U-95, both subs were on the surface at night; in the other two, the Dutch sub was submerged, the Axis sub on the surface.
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