The Underwater Demolition Command (Greek: Διοίκηση Υποβρυχίων Καταστροφών), abbreviated as DYK (Greek: ΔYK,Greek pronunciation: [ðik]), until 2002 known as the Underwater Demolition Unit (Greek: Μονάδα Υποβρυχίων Καταστροφών), abbreviated as MYK (Greek: ΜYK,Greek pronunciation: [mik]), is the Greek Navy's elite special warfare unit.