just a could things!! for the shell, it looks like nobody's really going to try to mess with it, but just throwing it out there that cal will also try to stop people from interfering.

for the sinkholes, if he happens to be around when one opens up, he'd try to keep people from falling and getting hurt, either by pushing them out of the way with the force or using force stasis until he can grab them!! idk if that's useful. he'll also help try to fix them — he's no civil engineer, but he's always down for manual labor. if the engineering team gives him something to do, he'll do it.

and questions!

▶ for the thessyx: cal would ask them about the leviathan, e.g. what kind of creature it is, what happened to it, what powers it had, etc., and what "children of the leviathan" means to them, like does that mean they think that the leviathan brought the hatchlings here? things like that!

▶ for the lovely mods: do the thessyx use energy/aura/magic/chi/the force or anything like that that cal might be able to sense in them? i noticed in some of the other answers that you mentioned the dream and telepathic interfaces so i'm curious if cal would be able to pick that up!