There was a low smirk across Nyx's face. "Well, what's a hole without the water." He rolled his eyes and then he thought about it. The thing about hot springs were the mineral infused water being heated by geothermal energy. That alone was what made a hot spring. Sure he could replicate the heat, and such - but would it truly be a hot spring? Nyx would say no.
"Not easily." He ultimately commented.
"Well, we can't have people relaxed all the time. What if one of the many disaster we deal with through the doors comes through to us." He glanced to Carol. "We still gotta be ready in some fashion." And that was why he continued his training.