Peridot
Peridot's hands chafe, her back strains, her mind thrums with exhaustion from constant use of her metallokinesis.
She hasn't worked this hard since the drill.
Pearl's her only work partner in this. They talk only about what they need to. There's no chatting, no joking, no singing. And if sometimes Peridot overhears a sound suspiciously like a sob— she hammers louder and ignores it.
Lapis, Amethyst, or Garnet will sometimes show up with some "high-tech" piece of human technology. Nobody asks where they 'found' it; it's all archaic by Homeworld standards anyway.
But hopefully it's enough to fix a spaceship.