Some posters seem unaware that it is possible to do a PA from the F/D via the oxy mask mike, although the audibility in the cabin might be dubious. Having initiated the descent & completed the QRH items, there will be several minutes of reduced work load. Time criticality is now less severe - diversion can be planned at a more comfortable pace once the aircraft is in breathable air, assuming their are no other problems dictating an immediate landing.