Underwater Demolition Command


The Underwater Demolition Command, abbreviated as DYK and known until 2001 as the Underwater Demolition Unit, abbreviated as MYK, is the elite special warfare unit of the Hellenic Navy and the corresponding naval special operations unit of the Cyprus Navy, forming the core underwater demolition and maritime commando capability of both Greece and Cyprus. Its Cypriot sister formation is the Underwater [Demolition Team (Cyprus)|Underwater Demolition Team (MYK) of the Cyprus Navy]. The unit is broadly considered equivalent to other naval special forces such as the United States Navy SEALs, the British Special Boat Service, Israel's Shayetet 13 and Germany's Kommando Spezialkräfte Marine.

History

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 evaluate a UDT operational capability for the Hellenic Navy. The first Greek officer who completed the American combat-diver school and then set up the unit in Greece was Nikos Kartelias, who trained with the United States Navy at the equivalent BUD/S course of the United States Navy SEALs.
The first operation of OYK happened in Cyprus in March of 1964 where a unit inserted by the port of Mansoura, undertook a short reconnaissance of the bay for weapons smuggling from Turkish militias and then proceeded to destroy the contents.
As the Cyprus Navy developed its own combat-diver capability, a sister formation, the Underwater Demolition Team (MYK) of the Cyprus Navy, was established with the assistance of Greek frogmen. The Greek and Cypriot MYK share a common training philosophy and curriculum, and personnel from both units frequently attend each other's courses and joint exercises.
In 1997, during the violent unrest that erupted in neighboring Albania, the OYK were responsible for taking control of the international airport of Tirana and the evacuation of 240 foreign dignitaries from Albania.
In 2008, OYK teams took part in Operation Atalanta, deploying onboard Hellenic Navy vessels off the coast of Somalia. The OYK would carry out counter-piracy operations for the rest of the Hellenic Navy's deployment to the region.
In late July/ early August 2014, Greek Navy SEALs undertook an operation in which they were to evacuate Greek and Cypriot and foreign citizens from Tripoli, Libya. The team entered the Tripoli port to carry out reconnaissance and to establish contact with local Libyan forces on the ground. The civilians were then evacuated, 89 being from either Greece or Cyprus and an additional 97 people being citizens of other countries. In total, 186 people were extracted. The civilians were transported by Libyan port authority RHIBs and then handed off to a Greek frigate which later sailed back to Piraeus.
In 2020, the Hellenic Navy began taking part in Operation Irini, a European naval task force tasked with monitoring and intercepting suspicious cargo close to the Libyan shores, as part of the arms embargo on Libya. OYK teams are tasked with executing VBSS operations. So far, a large number of onboard visits have been carried out by the teams.
On 30 April 2020, a boat had entered Greek Waters unmanned and without making any contact with the Cypriot authorities. Immediately the Cyprus Joint Rescue Coordination Center called for the Underwater Demolitions Command to respond, and boats carrying the SEALs were sent to the area. Upon arrival, they found two people who later told them that due to technical difficulties on the boat, it began acting erratically and had in fact at first thrown them off. Because of this, the two people were transported to Larnaka hospital and the boat was transported to land by the Underwater Demolitions Command.

Notable commanders

Several senior officers of the Hellenic and Cypriot navies have commanded the unit over time. Admiral Evangelos Apostolakis, who later served as Minister of National Defence of Greece, is a former commander of the Greek OYK. Rear Admiral Costas Fitiris, a former commander of the Cypriot Underwater Demolition Team, was appointed Minister of Justice and Public Order of Cyprus in December 2025. Another notable commander is Rear Admiral Danny Theofanidis, a career Hellenic Navy officer from a family with a long-standing naval tradition.

OYK training

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.

OYK equipment

The OYK is known to use various types of firearms to complete their missions with some guns being customized to be able to adapt to the marine environment of the OYK.

2015 Independence Day Parade Controversy

The OYK generated controversy at the Greek Independence Day parade of 2015, when it chanted a nationalistic refrain: «Και το όνειρο μας είναι / στην Πόλη εμείς να μπούμε / σημαία να υψώσουμε / τον ύμνο εμείς να πούμε», roughly translated as 'Our dream is to enter Polis to raise our flag and sing our anthem'. Opposition ministers from the PASOK party launched attacks on the defence Minister Panos Kammenos, accusing him of mishandling matters of vital foreign policy. Concerns were also expressed by the government MP Vassiliki Katrouvanou, who called the chants 'a clear offense to our republic', and highlighted the ongoing need to remove certain far-right elements from the Greek armed forces.