Navy , battleships and minesweepers hunt for vessel . The search began Thursday after Swedish intelligence picked up an emergency radio call in Russian , reported The Local , citing the Swedish newspaper Svenska Dagbladet . ` Emergency radio call picked up by Swedish military , report says . Radio transmissions sent to Russian Navy on Baltic Sea , report says . Russia denies any vessel in Swedish waters .
Navy , battleships and minesweepers hunt for vessel . Emergency radio call picked up by Swedish military , report says . Radio transmissions sent to Russian Navy on Baltic Sea , report says . Russia denies any vessel in Swedish waters .