Peru has signed contracts with Elbit and ThyssenKrupp to modernize four U209-1200 submarines.

The expansion project will involve bringing in Germany's ThyssenKrupp as the prime contractor for work on the BAP Angamos (SS-31), BAP Antofagasta (SS-32), BAP Pisagua (SS-33) and BAP Chipana (SS-34), according to a Defensa.com report.

The modernization program commenced last year.

The work will include hull separation and modernizing or replacing the command and control systems.

Overhaul work will also focus on weapons systems, mechanical and electrical equipment, hydraulics, electronics and optical gear.

ThyssenKrupp will plan and oversee the work while also providing a technology transfer program that will include training Peruvian specialists and implementing welding equipment, measurements and quality control.

Elbit has been brought on to modernize the boats' electronic warfare capabilities, Peruvian shipbuilder SIMA said.