Hybrid propulsion is already a thing in the marine world (often in navy/military designs): * https://en.wikipedia.org/wiki/Combined_diesel–electric_and_gas htt

Hybrid propulsion is already a thing in the marine world (often in navy/military designs): * https://en.wikipedia.org/wiki/Combined_diesel–electric_and_gas https://en.wikipedia.org/wiki/Combined_diesel–electric_and_g... * https://en.wikipedia.org/wiki/Combined_diesel–electric_and_diesel https://en.wikipedia.org/wiki/Combined_diesel–electric_and_d... * https://en.wikipedia.org/wiki/Integrated_electric_propulsion https://en.wikipedia.org/wiki/Integrated_electric_propulsion