Navy plans €85,000 restoration of Isaac Peral submarine

The Spanish Navy has awarded an €85,000 contract to undertake a comprehensive restoration of the interior of the Isaac Peral submarine, slated for completion by November 2027. This marks more than a decade since the vessel's exterior received its last restoration effort. Located in Cartagena's Naval Museum, the Isaac Peral submarine honors the legacy of its namesake, a pioneering inventor who designed the first electrically propelled submarine in the late 19th century.

Built in Cádiz and tested in 1889 and 1890, the vessel's design was deemed groundbreaking, though the Navy ultimately discontinued its development after trials.

Constructed at La Carraca shipyard, the submarine remained there until transferred to Cartagena in 1914, where it was later showcased to the public in 1965. Decades of exposure to environmental factors had taken their toll on the metal structure, with corrosion particularly pronounced around the base where accumulated water threatened integrity. While the exterior was cleaned and treated against further corrosion in 2012, the interior restoration remained a significant challenge.

The latest assessment revealed further deterioration, with ballast-filling mortars contributing to weakened structural elements. Despite these challenges, parts of the submarine remain remarkably well-preserved, including original paint, Fresnel-type skylight glass, leather battery insulation, wooden supports, and ceramic electrical components. However, much of the surviving glass is damaged, while leather insulation is in poor condition.

The successful bidder will have 15 days post-contract to present a detailed restoration plan, which must adhere to strict guidelines emphasizing minimal intervention using reversible materials that respect the submarine's historical authenticity. The narrow, poorly ventilated interior necessitates stringent safety measures for workers, including provisions for access, fresh air circulation, and adequate lighting.

The restoration process, covering metalwork, paint, glass, wood, textiles, ceramics, and wiring, will be documented through laboratory analyses, photographs, and maintenance recommendations before being reviewed by the Navy and Ministry of Culture.