OEP is the Oxygen Enrichment Program. Its' goal is to enrich the atmosphere with Oxygen until such time as the O2 level is at or above 25%.
Dead Zones (search you tube or google) are areas in both air and water that do not contain enough oxygen to support the life form in question, and so, they all die. Dead Zones have been increasing in both frequency and severity the globe over since they first were noticed in 2005. Insects, birds and fish the globe over have been and are dying in the billions right now, and this will continue until there are no insects birds and fish remaining.