8. Thermoelectric Propulsion Systems
These creative systems turn temperature variations between surface and deep seas into useable electrical power for propulsion. These systems’ efficiency has been much raised by advanced thermoelectric materials and better heat exchangers. By allowing submarines to extract energy from their surroundings, technology helps to lower reliance on stored energy sources and increase operating lifetime. Recent advancements in nanomaterials have improved the conversion efficiency, so thermoelectric propulsion becomes a more and more practical extra power source for contemporary submarines.