So... Three companions... four, if Jack decides to come along for the ride for some reason... are about to set off on the Quest of Ardent. Gavia thinks that this is all quite crazy but it isn't as if she really has any serious choice if she wants to find a way home.
Alice has just admitted that the state of the world beyond her personal region is unknown to her. There could be anything - super-mutated post-humans specialised for arboreal or subterranean life, AI colonies, vast radioactive deserts where the Blink went horrifically wrong. Maybe, ultimately, we'll visit the Space Habitats and learn a little about Gavia and Ardent's home culture.
Here's a thought: I believe that seeing that the townsfolk were able to fix the pump without her was the final key. Alice is now sure that they can care for themselves even in the event of her extended absence. So, she can take the time to give this matter the attention that it deserves.
We are now ready for the coming of Volume 4:
The Lord of the Nanomachines
~~~
The Fellowship of the Space Frat Boy
I think it tells you a lot about Ardent's personality that, after everything that has happened to him over the past volume or two, his response to this turn of events is: "Yeah! Adventure!" Pure enthusiastic optimisim; that's our Blue!
Meanwhile, Gavia continues to sulk, scowl and... well, basically act like a teenage girl. Which makes her insistence that "We are not children" all the more ironic.
Who's Alice's "acquaintance?" I vote Bubbles. Or another Alice clone.
No AIs left on Earth, remember? I'm thinking that it might be one of Alice's kind or possibly someone with a connected back-story to Alice. It's quite likely that, due to events, any friendship that they may have ever shared has long since been buried in millennia of petty disagreements, inadvertent slights and that, after a few thousand years you could get tired of anyone's face.
[edit]
Wait a minute! There's a Big Red Button? Since when has there been a Big Red Button and what exactly does it do so that Alice will know to come running? Proof that she has a radio transceiver in her somewhere?
(https://thetimedok.files.wordpress.com/2013/02/big-red-button.jpg)
Big Red Button!