NEW : Xue Long icebreaker is beset by ice and ca n't move . Comment: Xue Long 's captain says no assistance is needed and vessel will try to break free . Australian icebreaker carrying the rescued people chugs toward base .
NEW : Xue Long icebreaker is beset by ice and ca n't move . Chinese ship 's helicopter helped rescue 52 passengers Thursday . Xue Long 's captain says no assistance is needed and vessel will try to break free . Australian icebreaker carrying the rescued people chugs toward base .