Submarine base in Bordeaux, France viewed from cours Henri Brunet in February 2012

Betasom

Betasom Bordeaux Submarine Base: Visiting Hours, Tickets, and Travel Guide

Date: 14/06/2025

Introduction

Situated in Bordeaux’s Bacalan district, the Betasom Submarine Base is an extraordinary testament to World War II engineering and the evolving cultural landscape of the city. Originally built for the Italian Royal Navy and later used by German U-boats, Betasom—an acronym merging “Bordeaux” and “Sommergibile” (submarine)—was a pivotal site during the Battle of the Atlantic. Its massive, reinforced concrete structure withstood intense bombing and now stands as a symbol of resilience and transformation. Today, this historic base is home to the Bassins des Lumières, Europe’s largest digital art center, where visitors can experience immersive exhibitions within the submarine pens. This guide covers Betasom’s history, architecture, visiting hours, ticketing, accessibility, and practical tips for travelers seeking to explore one of Bordeaux’s most unique attractions (uboat.net; Bassins des Lumières).

Betasom History and Strategic Context
Architecture and Wartime Operations
Cultural Transformation: Bassins des Lumières
Visiting Information
Frequently Asked Questions (FAQ)
Summary and Final Tips
References and Further Reading

Interior view of Bordeaux submarine base showing concrete structure and lighting

Interior view of the Base sous-marine de Bordeaux showing massive concrete structure and dock

Betasom History and Strategic Context

Betasom was founded in 1940 as the Atlantic submarine base for the Italian Regia Marina, later shared with the German Kriegsmarine. Its position, about 60 miles inland along the Garonne River, provided protection from air raids while allowing direct maritime access to the Atlantic (uboat.net). As the war progressed, Betasom became a crucial logistical and operational hub for various submarine flotillas, including the German 12th U-boat Flotilla and specialized supply subs.

Architecture and Wartime Operations

The base was constructed between 1941 and 1943, featuring a colossal bunker measuring approximately 245 meters in length, 162 meters wide, and 19 meters high. The roof, up to 9 meters thick, was engineered to resist even the most powerful bombs (Bassins des Lumières; volare.volotea.com). Inside, there are 11 enormous pens—4 wet and 7 dry—capable of sheltering up to 15 submarines, alongside workshops, crew facilities, and an internal street (WhichMuseum). The base’s construction involved thousands of workers, including many Spanish Republican prisoners.

Despite repeated Allied bombings, the bunker remained largely unscathed, making it one of the best-preserved WWII military sites in France (Spotting History; Invisible Bordeaux).

Cultural Transformation: Bassins des Lumières

In the decades following the war, Betasom’s imposing structure was repurposed as a space for cultural innovation. Since 2020, the Bassins des Lumières has occupied much of the base, transforming the submarine pens into vast digital galleries. Here, immersive exhibitions project masterpieces by artists like Monet and Klimt onto the concrete and water surfaces, blending history with art in a captivating atmosphere (Bassins des Lumières).

Visiting Information

Location and Access

Address:
Bassins des Lumières
Impasse Brown de Colstoun
33300 Bordeaux, France

Betasom is located in the Bassins à flot area, north of Bordeaux’s city center, and is easily accessible via tram (Line B, “La Cité du Vin” or “Bassins à flot” stops), bus lines 9 and 32, city bike rentals, or by car (paid parking available at nearby lots) (Salt in Our Hair).

Opening Hours

Bassins des Lumières: Open daily from 10:00 AM to 7:00 PM (last entry at 6:00 PM). Hours may extend during special evening events and vary on holidays. Always check the official website for seasonal updates.

Tickets and Booking

Adult tickets: Approximately €15–€20.
Discounts: Available for students, children, and seniors.
Bordeaux CityPass: Offers free or discounted entry, plus public transport and other site access.
Booking: Advance online booking is highly recommended, particularly on weekends and for special events (Bassins des Lumières Tickets).

Accessibility and Facilities

Wheelchair Accessibility: Main exhibition areas are accessible via ramps and elevators; accessible restrooms and parking are available (Accessibility Information).
Facilities: On-site amenities include restrooms, a café/snack bar, cloakroom, and a gift shop.
Wi-Fi: Free in public areas.
Photography: Non-flash photography is permitted except during certain exhibitions.

Guided Tours and Visitor Experience

Guided Tours: Offered in French regularly and in English on select dates/by arrangement (Bordeaux Tourist Office). Tours cover both the historical and cultural facets of Betasom.
Exhibitions: Rotating digital art and contemporary exhibitions are programmed throughout the year. Check the official agenda.
Duration: Plan 1.5–2 hours for a thorough visit.

Nearby Attractions

La Cité du Vin: Bordeaux’s wine museum.
Les Halles de Bacalan: Vibrant food market.
Garonne River cruises (Short Cruises in Bordeaux).
Restaurants, bars, and hotels such as Radisson Blu and Seeko’o Hotel are within easy walking distance (Where to Stay in Bordeaux).

Travel Tips

Dress warmly and wear sturdy shoes; interiors can be cool and damp.
Photography is usually permitted, but check restrictions for exhibitions.
Combine your visit with the Bassins à flot waterfront or La Cité du Vin.
Weekdays and early mornings are quieter; weekends are busy.

Frequently Asked Questions (FAQ)

Q: What are Betasom’s opening hours?
A: Daily from 10:00 AM to 7:00 PM (last entry 6:00 PM), with possible extended hours for special events.

Q: How do I buy tickets?
A: Purchase online via the Bassins des Lumières website, at the Bordeaux Tourist Office, or on-site.

Q: Is it accessible for wheelchairs?
A: Yes, most main areas are accessible with ramps and elevators.

Q: Are there guided tours in English?
A: Yes, on select dates or by prior booking.

Q: Can I take photographs?
A: Yes, non-flash photography is generally allowed.

Q: What else can I visit nearby?
A: La Cité du Vin, Les Halles de Bacalan, Garonne riverfront, and the revitalized Bassins à flot district.

Summary and Final Tips

Betasom exemplifies the fusion of Bordeaux’s wartime history with contemporary culture. Its formidable WWII architecture now hosts world-class digital art, offering a unique experience for visitors interested in history, architecture, and creativity. Conveniently located and accessible, Betasom is a must-see for any Bordeaux itinerary. Book tickets in advance, plan for at least two hours, and explore the surrounding Bacalan district for a full day of discovery (Bassins des Lumières; Spotting History; Bordeaux Tourism; uboat.net).