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You should know, even the Fire Raven class warships that Finn Lewis currently commands are not fully enclosed structures—many parts use force fields to isolate the air. This doesn't hinder the launch of the warships or space mechas, and while the air can't escape, it's as if they're in the open air.
Yet, the warships here had adopted an older design, a fully enclosed structure, meaning they were made entirely of metal without any open hangars, etc. Of course, their hangars could indeed be opened. But there was only one reason for doing so—they must believe the material used to craft these warships was extremely advanced.
Otherwise, they wouldn't have made such a choice. Finn Lewis had already discovered that the material used for these warships was an unfamiliar new material, entirely silver, somewhat similar to this planet.
