Could this be Electromagnetic Field (EMF) Radiation?(possibley created from a magneto-hydrodynamic generator or a geothermal generator) In moderate to high and extended doses it can cause reproduction problems, along with skin rashes, neurological/mental disorders, severe headaches and the list goes on... The concrete could be for an Electromagnetic Field thats imploding. Our microwave ovens and beloved cell phones produce a type of EMF in small doses, all electronics do. Whatever is behind the concrete is a little more powerful than a cell phone. There is the Dark Trritory on the Island. Rousseau did claim that it was a very bad place on the island, maybe thats where the EMF Radation is the strongest.