Polish Orca undetectable? We check what the Swedish AIP can do

The biggest limitation of submarines has always been the limited time they spend underwater. erstwhile sailing in a surface position, the electrical motor driving the propeller is powered by a system: an electrical generator and a diesel engine. However, this is impossible underwater, and then the energy reserve provided by lead-acid batteries is used. And this reserve wears out very rapidly erstwhile utilizing the engine and is fundamentally adequate for 3 days.