The titan power core has been lost for decades. For some reason, on this calm night, it seems to have reactivated and worked its way to the waters surface.
And in your slumber you dream of warm cherry pie, freshly baked bread and the smoky aroma of slow cooked ham.
No wonder you feel more healthy after a long rest!
You expected it to be completely uninhabited. Lost to the sands of time, yet when you arrive. Torches are lit and the whole entrance to the temple is bathed in a warm pink light.