1.   But there have been at least two cases of private divers trying to reach the wreck.

2.   It was unclear whether the robot reached the wreck.

3.   It was unclear whether the recent attempts to reach the wreck were successful.

4.   The icebreaker was not authorized to board the tugboat, but it was unclear whether the robot, reportedly equipped with mechanical arms, reached the wreck.

5.   The remote, largely unexplored region has thwarted all previous efforts to reach the wreck.

6.   There have been at least two cases of private divers, usually hired by families or salvage companies, trying to reach the wreck.

7.   Officials said rescuers reached the wreck on Saturday afternoon and most of the bodies were recovered during the weekend.