WATCH: ABC News' Matt Gutman explores a cave


  • Now Playing: Rescue in Thailand: 4 boys pulled from cave



  • Now Playing: A look inside Thai cave where boys remain trapped



  • Now Playing: 4 boys rescued from Thailand cave



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  • Now Playing: 4 boys pulled safely from the cave recovering at a hospital



  • Now Playing: ABC News’ Matt Gutman explores a cave



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  • Now Playing: Rescue in Thailand: 4 boys safely pulled from cave



  • Now Playing: Rescue in Thailand: Remaining boys, coach to be rescued in 10 to 20 hours



  • Now Playing: 4 boys rescued from flooded cave in Thailand



  • Now Playing: 2 boys rescued from Thai cave



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  • Now Playing: Authorities in Thailand continue preparations to extract the boys trapped in a cave





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