oslo body man die russian mi-8 helicopter crash arctic archipelago svalbard thursday find near crash site bottom sea office governor svalbard say monday eight russian men five crew three passengers die board helicopter crash thursday way abandon pyramiden settlement coal mine port barentsburg decease locate rov remotely operate underwater vehicle ocean floor approximately 130 meter 142 yards helicopter office governor svalbard say statement website monday first body locate crash seven individuals miss presume dead one body find near wreckage russian helicopter svalbard