What is the difference between diesel and electric power for diesel submarines?
Diesel subs use electric motors with battery power when submerged. The fuel status indicator shows the endurance at the current throttle setting. If you switch from creep to cruise you should see a dramatic drop in the amount of endurance. To charge batteries, you need to go to at least periscope depth to run the diesel engines to charge the batteries. The battery charge process happens automatically when you reach periscope depth as the sub will start using the diesel engines as soon as the snorkel can be deployed. There are two fuel indicators for diesel subs, one shows the endurance at the present speed and the other shows the endurance capability of the batteries.
