| 多發幾張圖補充. 
  Danger on the horizon: The huge male polar bear (circled) pokes his head out from behind a chunk of ice as he watches the mother and her two cubs
 
 
  Let's get out of here: The three bears plunge into the water to escape the hungry male
 
 
  Swim for it: The dramatic chase was witnessed by tourists on a sightseeing expedition Spitsbergen in Norway
 
 
  Can't keep up: The old male polar bear was not fast enough to catch the family
 
 
  Quick snack: Despite their flight from the male polar bear, the family still managed to make their way to eat another bear's kill
 
 
  Any sign of him? After their dramatic swim to safety one of the cubs and his mother keep watch for the threatening male
 
 
  Keeping an eye out: The incredible images were captured by British tour guide and photographer Paul Goldstein
 
 
  The stunning creatures continued to swim right under the bow of the ship. At first the astonished tourists did not realise they were fleeing from the male bear
 
 
  Can't catch me: One of the young cubs rears up to get a look at the old male chasing them
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