I made it back to the Bubble and have started the never ending engineering of the Uncle Ed.
Finding some things out in the black that I've not seen before... :) These have been designated "Void hearts". It is unclear what drives the internal reaction but there is an infrequent rather intense release of light and heat from them. It doesn't appear to come with any sort of concussive force which suggests a purely energetic reaction. No chemical residue to create a pressure wave.