He doesn't swim naked, so he takes the summon anyway.
"They got around me while I was on Earth," he says. "So there must be multiple routes through the maze between clam planet and Earth. I didn't check the whole maze. Want to, as long as their current strategy seems to have been 'plug the hole and run like hell'?"
And Elarron ensures that the relays are untroubled by goo. Or burning sand. Why is all this stuff so horrible.
Map map map.
Water water water. Some of these Spheres are getting pretty drowned. Whatever, it's not a big problem.
Yeah, Elarron can go back and shrink the water if anybody wants to use them for any non-aquatic purposes.
It turns out there are multiple portals from the maze to Earth. Five in total. They are all abandoned, and three of them are full of burning goo. Elarron waters it.
"Welcome to Earth. I am afraid the aliens killed all the cool wildlife. Didn't know what a butterfly was. But it's still Earth."
"Humans come from Earth. Well, humans come from the Earth I know about, anyway, and since your clam planet turns out to be a Sphere with a maze leading to Earth it seems like a reasonable bet that your lot did too."
"Well, you're not really seeing Earth at its best," Cam objects, producing his computer and a little slideshow of landscapes and pictures taken from orbit.
He makes another shuttle.
Cam gets into space and notes the locations and quantities of space debris (all of alien manufacture) and adds telescopes and has a look.
Telescopes show... a perplexing lack of fleeing alien ships.
"Do they fucking have FTL? How the fuck am I supposed to deal if they have fucking FTL," mutters Cam.
"They're not in the system. They haven't had time to get to Jupiter, let alone out of the system, if they were limited by the usual speed limit in Normal Physics World, so either they have a method of crossing vast distances instantly that is like but not identical to Spheres because they can't stand having wings, or they have a sort of spaceship that can travel faster than light. Which I want. And can make! But it will be an alien design I won't know how to pilot and I don't know which way they went!"
"Rather." Cam aims the ship down at the ground again. "I'm going to play Hilarious Infosec Hazard, you want to stay or go home?"
"Conjuring everything the aliens said about leaving Earth?" he guesses. "Sounds like fun, but maybe I should go home, there are still members of my family who haven't yelled at me yet."
"Okay. Relays look to be going undisturbed, but just portal back and have a look if I'm incommunicado, please, don't have your brother commit suicide. You're as indestructible as I am now, you'll be fine if you have to be a one-person search party."