The code wasn’t in the ship’s archives. It wasn’t in the captain’s logs or the black box. Panic had spread through the 500 sleeping passengers in cryo, but Marcus was the only one awake — the night engineer, alone with a ghost in the machine.

Marcus typed it in. The terminal chimed. Systems roared back to life. And somewhere, across 40 light-years, a long-silent beacon began to blink.

He wasn’t alone anymore.

His mother’s voice, tired and tender: “Idownergo — I don’t want to go. But you have to. If you’re hearing this, the colony mission failed. This registration code isn’t for the ship. It’s for the beacon. Enter it, and Earth will know you’re still alive.”

Since that looks like either a typo or a fictional term, I’ll assume you want a where that phrase is central to the plot. Here’s a story built around it: Title: The Last Registration Code