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Underwater Demolition Command
DYK emblem
Underwater Demolition Command (DYK) emblem
Country Flag of Greece.svg Greece
Branch Hellenic Navy Seal Hellenic Navy
Service history
Active 1957Present
Role  • Special Reconnaissance (SR)
 • Direct Action (DA)
 • Military assistance (MA)
 • Combat Search And Rescue (CSAR)
 • Collateral Activities (CA)
 • Counter-Terrorism (CT)
Part of Naval Training Command
(Greek: Διοίκηση Ναυτικής Εκπαίδευσης (ΔΝΕ))
Nickname  • Frogmen (Greek: Βατραχάνθρωποι)
 • Frogs (Greek: Βατράχια)
 • OYK (Greek: ΟΥΚ)
 • Oykades (Greek: Οϋκάδες)
Website Underwater Demolition Command
Commanders Captain Konstantinos Egkolfopoulos
Insignia Δ.Υ.Κ.
Hellenic Navy sailors

Greek Navy MYK team on exercise

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.


Carrying on the tradition of the Hellenic Navy in naval special operations, the unit was established in 1957 with help from the United States Navy's Underwater Demolition Team, when two Greek officers were sent to Little Creek in Virginia to study UDT operations[citation needed]. On their return, they trained a dozen men who formed the nucleus of the MYK cadre. The OYK has been deployed on numerous occasions[citation needed]. It was deployed during the first Gulf War in 1991, providing assistance for the naval embargo against Saddam Hussein, boarding 217 suspect vessels[citation needed]. In 1996, the OYK was involved in the Imia crisis when Turkish commandos infiltrated the island. Small DYK teams infiltrated surrounding islands to observe activities, pending a political solution to the crisis and withdrawal of Turkish forces[citation needed]. In 1997, during the violent unrest that erupted in neighbouring Albania, the OYK were responsible for taking control of the international airport of Tirana[Clarification needed] and carrying out recovery operations of Greek and other foreign diplomats[citation needed].


The DYK is organised into subsections called Underwater Demolition Teams (Greek: Ομάδες Υποβρυχίων Καταστροφών), commonly known in their abbreviated form as OYK (Greek: ΟΥΚ,Greek pronunciation: [oik]), that specialise in a particular area. Each subsection consists of 25 men split into five teams of five.

OYK 1/2: This is the main offensive section of the OYK that specialises in sabotage, raids and maritime counter-terrorism[citation needed].

OYK 3: This section specialises in reconnaissance. Establishing and reconnoitering beach landing sites prior to a main amphibious assault[citation needed].

OYK 4: The section specialises in underwater demolition/EOD of obstacles that may prevent an amphibious landing[citation needed].

OYK 5: This section is a reserve section that is only activated in times of war or serious emergency. It is made up of reservists from the MYK and instructors from the main body[citation needed].

The selection and training course lasts roughly seven months and is divided into three phases similar to that of the US Navy SEALs BUD/S course. The course has an extremely high failure rate similar to that of its US counterparts. The candidates will go on to airborne school and then continue to learn advanced naval special warfare techniques[citation needed].

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