oslo hop find survivors russian helicopter disappear coast arctic svalbard archipelago fade friday norwegian rescuers search vain second day ice-cold water eight russian men five crew three passengers list miss norway rescue coordination center location russian-made mil mi-8 aircraft remain unknown 24 hours disappear helicopter way abandon pyramiden settlement coal mine port barentsburg russian coal company arktikugol run mine employ russian ukrainian miners assumption helicopter crash approach two kms north kapp heer accident investigation board say statement refer local helicopter base snowy weather high wave complicate efforts region almost daylight time year air temperature around minus three degrees celsius 27 degrees farenheit search use small remotely-operated submarine yield sign helicopter rescue coordinators say dash early hop submerge wreckage locate somewhat big submarine fly expect operational saturday rescue center say still conduct search rescue operation move recovery phase new submarine complete search spokesman norwegian coordinator say locate around 700 kms 435 miles north european mainland svalbard govern treaty grant nato-member norway sovereignty allow signatories business exploit natural resources 40 countries party treaty moscow maintain presence islands decades strategic foothold high north hop fade russians miss arctic helicopter accident