Combat Divers Group
Grupamento de Mergulhadores de Combate
Coat of arms of GRUMEC
"Ordem do Tubarão" (Order of the Shark) Insignia
Active10 March 1998; 26 years ago (1998-03-10)[1]
Country Brazil
AllegianceSubmarine Force Command
Branch Brazilian Navy
TypeSpecial forces
Garrison/HQMocanguê Grande Island, Niterói, RJ
Nickname(s)"Tubarões" (Sharks)
Motto(s)Fortuna Audaces Sequitur ("Fortune follows the brave")

The Combat Divers Group (Portuguese: Grupamento de Mergulhadores de Combate), abbreviated to GRUMEC, is a special operations and counterterrorism unit of the Brazilian Navy. Their main attributions include tasks such as reconnaissance, sabotage, hostage rescue and the elimination of targets of strategic value in maritime and riverine environments.

Subordinate to the Submarine Force Command, GRUMEC teams can be deployed from one of the Navy's vessels as well as via rotary-wing and fixed-wing aircraft, mini-submarines, kayaks, via diving or in inflatable boats that can be launched from the submarine while it is still under water.[7]

A member of the force is known as a "MEC", which is an abbreviation of "mergulhador de combate", meaning "combat diver".


GRUMEC operators during ASPIRANTEX 2019.

GRUMEC's history dates back to 1964, when two officers and two seamen of the Brazilian Navy passed the US's UDT-SEALs course. From their experience, the Divisão de Mergulhadores de Combate (Combat Divers Division) was created in 1970 at the Almirante Castro e Silva Base. Two years later, two officers and three seamen were sent to France, where they passed the "Nageurs de Combat" course. Mixing the French techniques, which focused on diving, with the American doctrine, which also emphasized land operations, the Curso Especial de Mergulhador de Combate (Special Combat Diver Course) was created in 1974, at what is now the Centro de Instrução e Adestramento Almirante Áttila Monteiro Aché (CIAMA).[8]

With the increasing demand for combat divers that followed, this Combat Divers Division was transformed into the Grupo de Mergulhadores de Combate (Combat Divers Group) in 1983, becoming subordinate to the Submarine Force Command. On 12 December 1997, the Grupamento de Mergulhadores de Combate (Combat Divers Group) was created, being activated in the 10th of March 1998.[1]


GRUMEC operator firing a HK416 A5

The Brazilian Navy Combat Diver's indoctrination and training methods are similar to other combat diver units such as the American SEALs, British SBS (Special Boat Service) or the Commando Hubert of the French Navy Commandos Marine.

For officers of the Navy, the initial requirements include passing medical and psychological examinations, testing in a recompression chamber and arduous physical tests. The call CAMECO (Enhancement Course of Combat Diver for Officers) lasts 46 weeks, is divided into four phases and aims to enable the military to operate diving equipment, weapons, explosives, tactics and techniques used for unconventional warfare and conflict low intensity, enabling them to perform, in short, the various types of Special Operations. Officers, of course, special emphasis is given to planning operations, but as a whole, the materials include: physical training and military defense; hygiene and first aid campaign, self-contained open-circuit, fighting techniques, riverine operations, demolition, weapons, communications, shore reconnaissance, submarine special operations, military planning process and case study, contemporary management, leadership; introduction to microcomputers, communications system of the Navy, and Intelligence.

For enlisted (corporals or male sergeants with less than 30 years of age and able to reenlist), there is a C-ESP-MEC - Combat Divers Special Course, whose requirements for admission are the same as CAMECO. The duration is 45 weeks of instructional activities also drawn as to the officers, but those who endure the enormous physical and mental pressure of the course will be adequately prepared for the specialized tasks assigned to MECS. GRUMEC training is the longest among Brazilian special operations forces.[8][9]

Operators deploying from Tapajó.

C-ESP-MEC is divided in three steps, named Alpha, Bravo and Charlie.

One of the last tests for GRUMEC candidates involves a 16 km swim, to be taken in pairs and using sidestroke, from Ilha Grande to Angra dos Reis. The pair of swimmers, meant to motivate each other during the crossing, is the inspiration for the GRUMEC unit pin depicting two sharks.[10]

After graduating the course, the sailor is called to serve in GRUMEC, where he has a full complement of training program and conduct advanced courses and internships in various areas such as deactivation of explosive devices (EOD), basic skydiving (static line jump), jumpmaster, HALO jump, HALO jumpmaster, precursor paratrooper (PREC), folding, maintenance and supplies by air (DOMPSA) stage basic mountaineering course in jungle operations, operational stage in the Pantanal, stage sniper (sniper), among others.


MECs conduct boarding demonstrations during Operation Guinex III.

Often operating out of the Navy's vessels, GRUMEC is present in most of the fleet's activities. Domestically, the group often takes part in training exercises that involve boarding vessels and oil platforms, as well as riverine operations in the Pantanal and Amazon.[1] GRUMEC took part in United Nations peacekeeping operations in Haiti and Lebanon. In the Brazilian Navy's contribution to the UNIFIL Maritime Task Force, the operators were responsible for boarding potentially armed vessels entering Lebanese territorial waters and instructing the Lebanese Navy on how to perform these types of operations.[4][3]

GRUMEC also instructs and contributes to the Brazilian Navy's Grupo de Visita e Inspeção (Visit and Inspection Group), responsible for inspecting vessels in the Brazilian EEZ.[1] Since 2021, combat divers aboard ships such as Independência, União and Liberal were also tasked with training Navy and Coast Guard personnel from partner nations such as Equatorial Guinea, Ivory Coast, São Tomé e Príncipe, Cameroon, Nigeria and Cape Verde in the Gulf of Guinea as part of Brazil's effort against piracy in the region.[5][6][11]

The group often trains alongside other frogman units from friendly countries, such as other Latin American operators or in Joint Combined Exchange Trainings (JCETs) with the U.S. Navy SEALs.[12][13][14][15][16]


Though largely classified, GRUMEC is reportedly composed of three special operations divisions, responsible for conducting activities such as special reconnaissance and direct action, and one Special Rescue and Recovery Group, designated as GERR-MEC (Grupo Especial de Retomada e Resgate - Mergulhador de Combate), responsible for high-complexity operations such as hostage rescue in environments such as ships and oil rigs.

MECs may only join GERR-MEC after having years of experience in the unit.[17][18]

See also


  1. ^ a b c d e "10 de Março: Dia do Mergulhador de Combate" (in Portuguese). Defesa Aérea e Naval. 10 March 2023. Retrieved 1 April 2023.
  2. ^ "NDD Rio de Janeiro - G 31" (in Portuguese). Archived from the original on 12 December 2022. Retrieved 12 December 2022.
  3. ^ a b "Brasil manda grupo de elite da Marinha para o Líbano" (in Portuguese). Folha de S. Paulo. 9 October 2011. Archived from the original on 25 January 2023. Retrieved 1 April 2023.
  4. ^ a b Dramatic boarding exercise with the Lebanese Navy and UNIFIL MTF (YouTube). UNIFIL. 16 May 2017. Archived from the original on 1 April 2023. Retrieved 1 April 2023.
  5. ^ a b "Fragata "Independência" realiza Operação "Guinex-I"" (in Portuguese). Brazilian Navy. 23 August 2021. Archived from the original on 26 March 2023. Retrieved 1 April 2023.
  6. ^ a b "Guinex-II: operação no Golfo da Guiné visa aumentar a segurança marítima no Atlântico Sul" (in Portuguese). Agência Marinha de Notícias. 18 June 2022. Archived from the original on 25 September 2022. Retrieved 1 April 2023.
  7. ^ "Combat Divers' Group: The Brazilian Navy's Elite Unit". Diálogo Américas. 21 January 2019. Archived from the original on 1 April 2023. Retrieved 1 April 2023.
  8. ^ a b c d e "(C-ESP-MEC)" (in Portuguese). Centro de Instrução e Adestramento Almirante Áttila Monteiro Aché. Archived from the original on 1 April 2023.
  9. ^ "GRUMEC: Mergulhadores de Combate, o que é, função e mais!" (in Portuguese). Estratégia Militares. 23 February 2023. Archived from the original on 25 February 2023. Retrieved 1 April 2023.
  10. ^ Fala Glauber Podcast (21 December 2021). MEC 130 (MERGULHADOR MILITAR GRUMEC)! Fala Glauber Podcast #62 (YouTube) (in Portuguese). Archived from the original on 1 April 2023. Retrieved 1 April 2023.
  11. ^ Operação Guinex II (in Portuguese). Brazilian Navy. 27 July 2022. Archived from the original on 7 July 2023. Retrieved 7 July 2023.
  12. ^ "Intercâmbio entre COMANF, GRUMEC E US Navy Seals é realizado no Batalhão "Tonelero"" (in Portuguese). Brazilian Navy. 17 December 2020. Archived from the original on 19 December 2020. Retrieved 1 April 2023.
  13. ^ "Forças Especiais SEALs , GRUMEC e COT e os seus equipamentos" (in Portuguese). DefesaNet. 25 April 2016. Archived from the original on 1 April 2023. Retrieved 1 April 2023.
  14. ^ "GRUMEC realiza adestramentos com equipe SEAL da Marinha dos Estados Unidos da América" (in Portuguese). DefesaNet. 5 June 2014. Archived from the original on 1 April 2023. Retrieved 1 April 2023.
  15. ^ "BR-US: Tonelero e GRUMEC treinam com os US NAVY SEALS" (in Portuguese). DefesaNet. 17 May 2019. Archived from the original on 1 April 2023. Retrieved 1 April 2023.
  16. ^ "Operadores de Forças Especiais da Marinha do Brasil treinam com Navy SEALs dos EUA" (in Portuguese). Brazilian Navy. 22 May 2019. Retrieved 1 April 2023.
  17. ^ "GRUMEC – as Forças Especiais da Marinha do Brasil". Defesa Aérea e Naval. 12 June 2013. Archived from the original on 1 April 2023. Retrieved 1 April 2023.
  18. ^ "GERR-MEC – Grupo Especial de Retomada e Resgate, do Grupamento de Mergulhadores de Combate" (in Portuguese). DefesaNet. 1 December 2013. Archived from the original on 1 April 2023. Retrieved 1 April 2023.