The Billion-Dollar Submarine Base to Host the Future Submarine Fleet, Including Nuclear Ones

Written by Bruno Teles

Published on 09/06/2025 at 15:55

A Base de Submarinos de Itaguaí: o berço bilionário da frota nuclear do Brasil

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Part of the Strategic PROSUB, the Submarine Base of Itaguaí (RJ) is one of the largest engineering projects in the country, designed to build and house the new generation of Brazilian submarines, including the future nuclear submarine

The Naval Complex of Itaguaí, in Rio de Janeiro, is the centerpiece of the Brazilian Navy’s Submarine Development Program (PROSUB). This engineering undertaking, worth billions of reais, was conceived to be the most modern submarine base in Latin America, empowering Brazil to design, build, and operate its future fleet, including the highly anticipated first nuclear-powered submarine.

Understand the magnitude of this project, the new generation of submarines it will house, the challenges of the program and the strategic importance of Itaguaí for the future of Brazilian naval power.

Why Is Brazil Building a New and Modern Submarine Base?

The creation of the submarine base of Itaguaí is a pillar of PROSUB, a program conceived in the National Defense Strategy of 2008. The objectives are clear: modernize the naval force, strengthen national defense, and crucially, protect the “Blue Amazon”, the vast Brazilian maritime zone rich in natural resources and trade routes.

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Inside the Naval Complex of Itaguaí (CNI)

The billion-dollar submarine base to house the future fleet of submarines, including the nuclear

The Naval Complex of Itaguaí (CNI) is a large-scale engineering project, divided into functional areas to optimize workflow and security. The main productive area, with 487 thousand m², houses construction and maintenance shipyards and the naval base.

The facilities feature notable characteristics:

Shiplift: A 110-meter-long platform with the capacity to lift up to 8 thousand tons, used to launch and recover submarines.

Interconnection Tunnel: With a length of 703 meters, it connects the northern and southern areas of the base, allowing for the safe transport of submarine sections.

Nuclear Facilities: The CNI includes a Specialized Maintenance Complex for the exchange of nuclear fuel and a Radiological Complex isolated, essential infrastructures for the operation of the nuclear submarine.

The New Guardians of the Seas, the PROSUB Fleet

The new submarine base will house two classes of vessels:

Riachuelo Class (S-BR): There are four diesel-electric powered submarines based on the French Scorpène design, but adapted to Brazilian needs, being larger and with greater autonomy. The Riachuelo (S-40) and Humaitá (S-41) have already been commissioned. The Tonelero (S-42) was launched in 2025 and is undergoing tests, and the Almirante Karam (S-43) is scheduled for launch in 2025.

SN Álvaro Alberto (SN-10): It is the most ambitious project: the first nuclear-powered submarine of Brazil. With a length of about 100 meters and 6,000 tons, it will have virtually unlimited autonomy and greater firepower. Its construction was officially initiated in October 2023, but the delivery schedule, projected for 2033, faces uncertainties due to budgetary constraints.

The Financial Outlook of PROSUB

PROSUB is one of the largest defense investments in Brazil’s history, with costs reaching tens of billions of reais. The nuclear submarine phase (SNCA), for example, has an estimated cost of US$7.4 billion.

The program faces significant budgetary constraints. The current annual funding, of about R$2 billion, is considered insufficient by the Navy to maintain the original schedule of the SNCA. Without an additional contribution of at least R$1 billion per year, the delivery of the nuclear submarine may be delayed until around 2040. Despite this, PROSUB generates a positive economic impact, creating about 22 thousand direct jobs and 40 thousand indirect jobs, and fostering the country’s Defense Industrial Base.

The Role of the Submarine Base of Itaguaí for Brazil’s Naval Power

The future of PROSUB and the submarine base of Itaguaí depends on overcoming financial challenges and navigating complex nuclear licensing issues and international safeguard agreements with the IAEA.

The realization of the program, with the operationalization of SN Álvaro Alberto, will have a transformative impact on Brazil’s ability to ensure its maritime security and project influence in the South Atlantic. The submarine base of Itaguaí is not just an engineering project, but a pillar of national sovereignty, a hub for technological development, and the heart of Brazil’s future naval force.

The Billion-Dollar Submarine Base to Host the Future Submarine Fleet, Including Nuclear Ones

Part of the Strategic PROSUB, the Submarine Base of Itaguaí (RJ) is one of the largest engineering projects in the country, designed to build and house the new generation of Brazilian submarines, including the future nuclear submarine

Why Is Brazil Building a New and Modern Submarine Base?

Inside the Naval Complex of Itaguaí (CNI)

The New Guardians of the Seas, the PROSUB Fleet

The Financial Outlook of PROSUB

The Role of the Submarine Base of Itaguaí for Brazil’s Naval Power

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The Billion-Dollar Submarine Base to Host the Future Submarine Fleet, Including Nuclear Ones

Part of the Strategic PROSUB, the Submarine Base of Itaguaí (RJ) is one of the largest engineering projects in the country, designed to build and house the new generation of Brazilian submarines, including the future nuclear submarine

Why Is Brazil Building a New and Modern Submarine Base?

Inside the Naval Complex of Itaguaí (CNI)

The New Guardians of the Seas, the PROSUB Fleet

The Financial Outlook of PROSUB

The Role of the Submarine Base of Itaguaí for Brazil’s Naval Power

While an average building in London or New York takes three years to be completed, in China a 26-story tower went up in five days with about 100 workers, and the global modular construction market already moves US$ 95 billion per year.

A Chinese factory in Guangdong is assembling a humanoid robot every 30 minutes while Tesla, Figure, and Boston Dynamics still struggle to deliver 10 thousand per year.

Australia installs giant concrete structures on the seabed 800 meters from the shore to create an ocean intake for desalination that will draw in saltwater and produce 30 million liters of drinking water per day.

Secret chamber sealed 4,500 years ago found in the Pyramid of Khufu, and Hawass announces its opening to the world in 2026

A public school student single-handedly created a machine capable of treating water for up to 50 people using only solar energy. It was awarded third place at one of the most important science fairs in the world.

Germany installed vertical solar panels on a lake in Bavaria, and the result broke conventional logic: instead of producing energy at midday peak, the plant generates more early in the morning and in the evening, exactly when families turn on appliances and factories are in full swing.

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