sentences:  Olympiacos is the most successful club in Greek volleyball history, having won 29 Greek Volley League titles, 16 Cups, 6 League Cups, all national records, and 2 Super Cups.They are the only volleyball club in Greece to have won a European competition, with 2 CEV Cup Winners' Cup/CEV Top Teams Cups (1996, 2005), and a traditional powerhouse in European volleyball, having been runners-up in all three main CEV competitions, two times in the CEV Champions League (with seven final four participations), two in the CEV Cup and one in the CEV Challenge Cup, totalling seven European finals.Domestically, Olympiacos holds the record for the most consecutive championships won, with eight in a row (1987–1994), and for winning seven championships undefeated (1968, 1974, 1979, 1981, 1988, 1991, 2018).