Cidolýn and Yôma Naira, during the last year of their secondary schooling, after which they would spend time as expatriate as their mother had. Their "class ship" was the Nulórien, a newly-completed warship classified as a "light cruiser" and heavily inspired by observations in modern shipbuilding from Honshu and elsewhere in Eurasia, and while demonstrably swifter and less manpower-intensive, were substantially less armed with modern weapons, reflecting their disadvantage in industrial-scale armament production. Because of the unavailability of petroleum in indigenous industries, indigenous warships were powered by hydrogen fuel cells, their fuel supplied by electrolysis techniques refined over thousands of years.