The S-80 program was launched in collaboration with IZAR (currently Navantia), the Spanish Navy and the Ministry of Defense on 25th March 2004 to construct four submarines which were initially scheduled for delivery in respectively 2011, 2012, 2013 and 2014. Due to a serious deviation in the vessel’s overweight control and also technical deficiencies of design as well as AIP system, the program was delayed several times. These boats acquired a notorious reputation for being 70 to 100 tons too heavy at one stage of the design process. The US submarine constructor General Dynamics Electric Boat was involved in the project as consultants to make the submarines buoyant again.  Navantia selected General Dynamics (GD) Electric Boat for technical assistance to fix the overweight and design failure of the submarine in May 2013. This collaboration was not entirely included in technical assistance within the scope of this agreement, technical and organizational restructuring were actualized, and new methodology and guideline were also adopted to overcome the deficiencies. 

Under this new model SSR (System Requirement Review), SDR (System Definition Review), PDR (Preliminary Design Review) and July in 2016, the CDR (Critical Design Review) was accomplished by Navantia. On December 19th 2018, the Complementary Execution Order for the S-80 Submarine program was signed. The pressure hall of the first submarine “S-81” was completed in December 2019. The “Isaac Peral “was launched in April 2021.