Greek submarine Delfin
...that the Greek submarine Delfin was the second submarine to enter service in the Greek navy?
...that the <b id="mwB_4"><a href="./Greek_submarine_Delfin" id="mwB_8" rel="mw:WikiLink" title="Greek submarine Delfin">Greek submarine <i id="mwCAA">Delfin</i></a></b> was the second <a href="./Submarine" id="mwCAE" rel="mw:WikiLink" title="Submarine">submarine</a> to enter service in the Greek navy?