On this week's "60 Minutes," overworked and under-resourced fire chiefs battling wildfires are getting backup from new hi-tech helicopters that can fight fires 24/7. Bill Whitaker tells us more. In an interview with Lesley Stahl, embattled Wyoming Republican Liz Cheney, who was ostracized by her party for voting to impeach President Donald Trump, discusses her decisions and re-election prospects. Alexey Molchanov now holds 24 records in free diving and promises to go even deeper. Sharyn Alfonsi has his story.

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