A blue whale entangled in crab pot line has remained out of sight since rescuers off the Southern California coast unsuccessfully tried to free the giant mammal earlier this week.

Dave Anderson of Capt. Dave's Dolphin & Whale Watching Safari said Thursday that boaters and even volunteers in airplanes have looked for the whale since it dove and disappeared near nightfall Monday after the rescue effort off Dana Point.

Anderson says he has seen other blue whales feeding on krill in the area but not the one with about 200 feet of thin line tangled either around a flipper or the mouth.

He says it would be normal for a blue whale to be feeding off California at this time of year and wouldn't be surprised if it's spotted again.