Just assume that Ramans were "złote rączki" and everything simply clicks together. I mean, if they were capable to build such ships in the first place, it wouldn't be (and wasn't) a problem to fill these with capable environmental control systems and suitable drive.
In the other books characters are put into hibernation so they could travel at high speeds. Perhaps atmosphere was removed and only minimal breathing mixture was provided for the passengers.
By the way, I think SciFun had an episode on this channel about O'Neill cylinder
In the other books characters are put into hibernation so they could travel at high speeds. Perhaps atmosphere was removed and only minimal breathing mixture was provided for the passengers.
By the way, I think SciFun had an episode on this channel about O'Neill cylinder