Bâtiment multi-mission

The Bâtiment multi-mission (B2M, "multi-mission ship") is a class of oceanic patrol ships of the French Navy. Dubbed the "Swiss Army knife of the Navy", the type of ships is due to perform sovereignty, law enforcement and logistics missions (such as policing illegal fishing, traffics and mining; assisting distressed ships, and search and rescue; and contributing to the logistics of Overseas collectivities ) from, replacing the aging BATRAL-class landing ships in this role.

Three units were initially planned, but a fourth one was ordered in early 2015 to cover the Mozambique Channel.

Missions and background
France holds the second-largest exclusive economic zones, totalling one million km² in the Indian Ocean and 1.7 million km² in the Southern Ocean. To enforce law in these areas, the French Navy has deployed a number of ships suitable for low-intensity engagements and with flexible capabilities: BATRAL-class landing ships, P400-class patrol vessels and D'Estienne d'Orves-class avisos, or Cold War design, have been deployed in this role, and stop-gap measures such as the Albatros were taken. More recently, the French Navy has procured classes of ship specifically designed for law enforcement and public service in the EEZ, such as the Floréal-class frigates.

In the 2010s, the aging of the BATRALs (Jacques Cartier, based in Nouméa, was decommissioned in April 2013 ) and the decommissing of Albatros in May 2015 led to the need to procure replacements for the naval stations of Port des Galets (La Réunion), Nouméa (New Caledonia), Dégrad des Cannes (Martinique) and Papeete (French Polynesia). In March 2006, the Service des Programmes Navals (SPN, "Naval Programme Service") started to study a replacement for the five BATRALs and for Albatros.

The ships initially envisioned would have been typed Bâtiments d'intervention et de souveraineté (BIS, "Intervention and Sovereignty Ships"); although they were to dispense with the amphibious capabilities of the BATRAL, they were to accommodate a company-sized force (120 men and 20 vehicles, including armoured vehicles). Four projects were evaluated, including the "MultiPurpose Projection Vessel" by CNIM, the "Echoship" by DCNS, the M.OPV by Piriou, and the UT 527 by Rolls-Royce Marine. In October 2013, a modified version of the M.OPV was co-contracted to Piriou and DCNS; a joint venture, Kership, was founded for the project.

Expenses of the contract, amounting to 100 million euro, were initially to be covered not only by the Ministry of Defence, but also by other branches of the government: 20% of the funds to acquire the ships and 50% of the maintenance would have been provided by other ministries. However, from July 2013, it was decided that the Ministry of Defence had to shoulder the burden alone.

Design
The design selected for the Bâtiment multi-mission eschews the amphibious capabilities of the previous BATRAL and the L-CAT design proposed by CNIM, similar to the Engin de débarquement amphibie rapide, for a concept of Platform supply vessel, or Anchor handling tug supply vessel. In line with most ship designs tasked for coastguard duty in the French Navy, the B2M will be built according to civilian standards; this was already the case notably for the Floréal class. The hulls are built in Poland, Piriou being tasked with the design of the ship proper and the finish in Concarneau, while DCNS work on the military aspects of the project.

The ships were to displace over 1000 tonnes, have a length comprised between 60 and 80 metres, and a motorisation of 8 000 to 12 000 HP.

Features and capabilities
The B2M are designed for a range of low-intensity, high-endurance missions in the French EEZ, from bases in the Overseas collectivities. As such, they feature a relatively low maximum speed of 12 to 15 knots, but are able to operated for 30 days without resupply, and are designed for a high availability of 200 days at sea per year. One of their main task is maritime law enforcement, particularly in the domain of commercial fishing and against illegal immigration, Drug trafficking and piracy.

The B2M provide a limited capability of power projection, as they can ferry a 20-man force, along with equipment and two vehicles; as the missions of the B2M are joint between the various ministries responsible for the maritime actions of the State, these forces can belong to any arm of the French Military, to the Gendarmerie or the Police. They carry an 8-metre boat and several rigid-hulled inflatable boats, and can deploy frogmen as well as Remotely operated underwater vehicles. The ship can also accommodate a medical team to be deployed during humanitarian emergencies.

To assist ships of distress, the B2M can develop a 30-tonne bollard pull and have extensive anti-fire capabilities. They furthermore feature a crane capable of lifting 12 tonnes with a 14-metre reach, or 10 tonnes at 17 metres. This allows autonomous loading and unloading of standard containers, a useful capability for humanitarian operations in disaster areas.