The HVDC undersea power cable SA.PE.I., Sardinia-Italy - Photo credits to: Terna The deepest submarine power cable in the world runs in the Tyrrhenian sea, 1,600 meters below sea level.

The research into molten carbonate fuel cells has it origins as early as the 1930s, Emil Baur and H.Preis in Switzerland experimented with high-temperature, solid oxide electrolytes.