( CNN ) -- Three crew members aboard a U.S. Navy helicopter that crashed in the Red Sea on Sunday were found alive and in stable condition , the Navy said . Two others remained missing . The MH-60S Knighthawk was operating with the guided-missile destroyer USS William P. Lawrence when it went down in the central Red Sea , which lies between Africa and the Arabian Peninsula . Search efforts are under way for the two remaining crew members . The cause of the crash is under investigation ; however , the Navy said it `` was not due to any sort of hostile activity . '' Helicopter crashes outside Phoenix with no apparent survivors . Four die in North Sea helicopter crash . Five dead in Pennsylvania helicopter crash .
Three crew members were found in stable condition . The ship was carrying about 4,200 tons of fuel oil and other chemicals when it ran aground on the rocks off Cape Cod last week.