Londie has appeared again.
Hint 1 of 6:
Talk with him about everything.
Hint 2 of 6:
You should know by now that you're going to have to sabotage the oxygen
generators to save the Cepheids.
Hint 3 of 6:
If you'll recall from an earlier video, Jacob already tried to do that, but
couldn't turn the valves manually.
Hint 4 of 6:
You'll need some kind of tool to close the oxygen valves on all of the
generators.
Hint 5 of 6:
Londie tells you that there's some such tool here in this cavern.
Hint 6 of 6:
After he leaves, look around the cavern.