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Collapse: The Forgotten Mines Under America

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Collapse: The Forgotten Mines Under America0Burden of Proof

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• Now Playing2minImages show damage to U.S. military assets from Iranian strikes
• Now Playing4minInvestigation into deadly crash of Los Angeles news helicopter underway
• Now Playing5minThe impacts rate hikes have on the economy and inflation
• Now Playing5minEd Sheeran tour controversy fallout continues
• Now Playing7min'A nightmare': Latino immigrants say they're in limbo after being deported to Africa
• Now Playing7minSean Combs' civil attorney seeks to withdraw over unpaid legal fees
• Now Playing4minGas and oil prices continue to rise
• Now Playing4minViolence in Middle East spikes gas prices
• Now Playing6minTech CEOs still raising alarms on AI
• Now Playing5min5 urns believed to contain human remains found in Philadelphia home
• Now Playing3minEU offers associate relationship to Canada
• Now Playing6minReporter, pilot among dead in news chopper crash
• Now Playing2minVigilante chase caught on Meta glasses camera
• Now Playing3minHelicopter crashes near scene of deadly bus crash
• Now Playing2minNew video shows fireworks that sparked deadly wildfire
• Now Playing3minGas and diesel prices surge as interest rate decision looms
• Now Playing3minKennedy Center board votes to close main building after Trump name ruling
• Now Playing2minCEOs double down on warnings as calls to slow AI cross party lines
• Now Playing5minImages show investigation into suspected tanker cyberattacks
• Now Playing3minCharlie Kirk's family signals intent to sue, alleges 'stunning failures'
• Now Playing7minAmerican historian's reaction to pivotal Supreme Court ruling over ballots
• Now Playing6minSen. Ted Cruz weighs in on debate over AI safety measures
• Now Playing8minThe Women's Pro Baseball League: A project 70+ years in the making
• Now Playing5minCoach Craig Bohl and Sen. Schmitt advocate for new NIL legislation
• Now Playing5minOpening acts bail on Ed Sheeran's US tour

Politics

• Now Playing3minTrump campaigns in GOP stronghold as state declares emergency over heating oil
• Now Playing1minRealtor suspected of spying for Chinese government arrested at LAX
• Now Playing2minTrump campaigns in critical states ahead of high-stakes midterm election
• Now Playing3minNew taxpayer-funded TV ads featuring Trump spark backlash
• Now Playing2minTrump heads to Ohio for midterm rally
• Now Playing3minTrump hitting 5 states in first major campaign swing
• Now Playing3minTrump heads to Texas as clock ticks down to midterms
• Now Playing7minWhat to know about the Protect College Sports Act
• Now Playing5minEthics expert: President Trump spent taxpayer funds on 'political propaganda'
• Now Playing1minIn exclusive with David Muir, Macron shares message to Americans
• Now Playing10minABC News Exclusive: David Muir one-on-one with French President Emmanuel Macron
• Now Playing3minTrump in New York for UN amid White House press ban
• Now Playing5minNews outlets file suit over Trump's White House media ban 
• Now Playing7minKY Gov. Andy Beshear on new book, JD Vance and how Dems can win in red states
• Now Playing4minWhite House bars CNN, MS Now and Politico reporters
• Now Playing3minTrump set to meet with Chinese President Xi Jinping
• Now Playing2minTrump rejects AI slowdown as Google reveals Gemini hacking incident
• Now Playing3minTrump threatens to demolish historic Kennedy Center
• Now Playing3minAmerican consumers brace as Federal Reserve hikes interest rates
• Now Playing3minTrump's Kennedy Center board votes to close building
• Now Playing2minSCOTUS rejects president's effort to limit mail in ballots
• Now Playing4minKash Patel testifies on FBI oversight before Senate committee
• Now Playing4minSupreme Court's rejection of mail-in voting restrictions a 'win for voters': Analyst
• Now Playing3minReport: Russian oligarch bankrolled festivities after Donald Trump Jr.'s wedding
• Now Playing6minLocal election officials prepare for pressure from federal government

Features

• Now Playing9minMahmoud Khalil sues Columbia University over alleged discrimination
• Now Playing7minTech CEOs raising alarms on AI as calls for regulation grow
• Now Playing3min'Difficult to see' how diesel price problem gets resolved: Analyst
• Now Playing2minArch Manning apologizes after reacting to AI video
• Now Playing3minDozens missing in Deadly Gaza building collapse
• Now Playing6minHow to make AI technology work for you
• Now Playing2minJalen Hurts donates $600,000 to Philadelphia's largest school
• Now Playing2minTexas Longhorns' Arch Manning apologizes over AI video response
• Now Playing2minNew video of man launching fireworks that sparked deadly wildfire, police say
• Now Playing6min16th Street Baptist Church marks bombing anniversary, opens education center
• Now Playing5minPro skateboarding legend Paul Rodriguez discusses career and impact
• Now Playing3minKennedy Center board's meeting to 'exclusively' focus on closure, court filing says
• Now Playing5minHow parents can navigate raising children in the digital age
• Now Playing3minMom learns missing son was found safe during press conference
• Now Playing3minSaudi Arabia escalates strikes on Houthis
• Now Playing7minBlacc Sam and Bino Rideaux discuss Nipsey Hussle's posthumous album
• Now Playing4minHighlights and surprises from NFL's Week 1
• Now Playing24minDeep Dive: Gypsy-Rose Blanchard and Dr. Deceit ----- 20/20: The After Show
• Now Playing3minCeline Dion returns to the stage
• Now Playing5minNFL Week 1 Preview
• Now Playing6minAmerican resilience stands through 9/11
• Now Playing7min9/11: 25 Years of Life, Love and Memories - Part 2
• Now Playing11min9/11: 25 Years of Life, Love and Memories - Part 1
• Now Playing3minSon carries on his father's legacy who helped people escape the South Tower on 9/11
• Now Playing2minDavid Muir sharers 9|11 tribute of drones illuminating NYC skyline with Twin Towers

Entertainment

• Now Playing5minSuper Bowl halftime performer speculation heats up
• Now Playing5minKit Harington on going from Westeros to Dickens' era France in 'A Tale of Two Cities
• Now Playing4min'Dancing with the Stars' sends home 1st couple
• Now Playing3minDolly Parton tribute special announced
• Now Playing4minEd Sheeran breaks silence after Macklemore dropped from tour
• Now Playing7minThe backlash against Sydney Sweeney's controversial new naked ad
• Now Playing3minEd Sheeran tour sees mass exit after Macklemore removed
• Now Playing4minBehind the scenes of 'Dancing With the Stars'
• Now Playing2minWhat we know about Hayden Panettiere death investigation
• Now Playing4minBiggest moments from the Emmys
• Now Playing2minPrince Harry, Meghan changes kids' schools over security concerns
• Now Playing4minBob Mackie remembered by Cher, Carol Burnett
• Now Playing2minRemembering the legacy of fashion designer to the stars Bob Mackie
• Now Playing4minKansas City Chiefs gear up for Monday Night Football opener
• Now Playing3minCeline Dion marks comeback in Paris
• Now Playing3minTiafoe, Shelton face off in historic US Open showdown
• Now Playing2minYankees, Mets honor 9/11 with ceremonial first pitches
• Now Playing4minChloe Benjamin talks new book, 'Under Story'
• Now Playing6minDerek Jeter reflects on 9/11 25 years later
• Now Playing4minMaking sense of new details about Billy Joel's health battle
• Now Playing3minBilly Joel opens up about his private health battle
• Now Playing3minCeline Dion prepares for comeback shows in Paris
• Now Playing2min1st nominations announced for 2026 CMA Awards
• Now Playing2minPrince Harry, Meghan react to King Charles' letter
• Now Playing7minSherri Shepherd talks 'Angel in the Rubble'

Business

• Now Playing5minThe looming threat of artificial intelligence technologies
• Now Playing2minRising mortgage rates price out some buyers
• Now Playing3minOpenAI discloses "concerning" incidents of AI gone rogue
• Now Playing2minKansas City Chiefs' Travis Kelce one of the victims in $35 million Ponzi scheme
• Now Playing3minAmerican consumers brace as Federal Reserve hikes interest rates
• Now Playing3minWomen account for 98% of August job gains
• Now Playing2minApple CEO unveils new foldable iPhone at price of $1,999
• Now Playing2minNTSB: Pilots of crashed cargo plane tried to abort landing
• Now Playing2minFormer AI researcher issues dire warning after resignation
• Now Playing2minU.S. attacks 5 Iranian oil tankers after Iran fires on U.S. warships 
• Now Playing3minAmazon cargo plane crash fatalities were in van hit by jet 
• Now Playing2minWhat to know about the Labor Day travel rush
• Now Playing3minWomen making strides in workforce, jobs report shows
• Now Playing3minAirlines battle it out for business
• Now Playing1minNBA punishes LA Clippers with major penalties over Kawhi Leonard salary scandal
• Now Playing4minTrump $1 coin enters circulation
• Now Playing2minSurging borrowing costs: What it means for your wallet
• Now Playing2minEconomy reality check: Fed signals rate hikes may be needed
• Now Playing2minMeta agrees to pay billions in landmark social media addiction case
• Now Playing5minDolly Parton's success in song and business
• Now Playing2minTrade war escalates as Canada imposes retaliatory tariffs on 700 US imports
• Now Playing6minCelebrating National Black Business Month
• Now Playing7minBusinesses brace for the impact of new tariffs
• Now Playing3minU.S. Treasury unveils new sanctions on entities that do business with Iran
• Now Playing5minDebt payoff strategies for borrowers switching payment programs

Health

• Now Playing2minSuspected fatal case of pneumonic plague in Russia
• Now Playing3minWhat to know about flu case levels in some parts of the US
• Now Playing4minNew study shows more new moms taking GLP-1s
• Now Playing4minMost Americans lack enough fiber for heart health: Report
• Now Playing2minMedevac helicopter crashes in Pacific Ocean near Catalina Island, killing at least 2
• Now Playing2minCostco enters the Medicare market
• Now Playing3minNew report reveals gap in breast cancer awareness
• Now Playing6minDoctors share the latest research on breast cancer
• Now Playing2minWall sits may help lower blood pressure
• Now Playing9minWhat to know about testicular cancer
• Now Playing15minABC News' Will Reeve reveals testicular cancer diagnosis, chemotherapy treatment
• Now Playing2minCancer blood test closer to FDA approval
• Now Playing6minWhat is kratom and why is it raising concerns?
• Now Playing1minFDA advisory panel votes in favor of approving a controversial cancer blood test
• Now Playing2minPediatric doctor killed, wife stabbed in home invasion outside Pittsburgh
• Now Playing1minLionel Richie admitted back to hospital
• Now Playing3minHow to reduce microplastics in your morning routine
• Now Playing3minGMA Health Alert: Sleep quality may help prevent disease
• Now Playing7minDr. Oz on push to lower Medicaid drug pricing
• Now Playing2minMiami hospital patient attacks emergency room employees
• Now Playing7minConjoined twins begin new chapter after successful separation
• Now Playing2minNew blood test could detect pancreatic cancer
• Now Playing2minStudy finds whole grains and cereal may reduce cardiovascular risk factors
• Now Playing4minPennsylvania reports 2 new measles-related deaths
• Now Playing4min'Alligator Alcatraz' detainees were confined to small metal enclosures: IG report

Election Zone

• Now Playing6minDemocrat looks to flip Kentucky senate seat
• Now Playing3minTrump campaigns in GOP stronghold as state declares emergency over heating oil
• Now Playing6minSen. Thom Tillis on Trump, midterms and why he regrets vote to confirm Pete Hegseth
• Now Playing2minTrump campaigns in critical states ahead of high-stakes midterm election
• Now Playing3minNew taxpayer-funded TV ads featuring Trump spark backlash
• Now Playing2minTrump heads to Ohio for midterm rally
• Now Playing3minTrump hits campaign trail following weaker-than-expected jobs report
• Now Playing3minTrump hitting 5 states in first major campaign swing
• Now Playing3minTrump heads to Texas as clock ticks down to midterms
• Now Playing3minTexas GOP candidate heard saying Trump's midterm convention hurt his campaign
• Now Playing3minPresident doubles down on AI growth as he hosts tech titans at White House
• Now Playing5min'Not a lot' GOP can do to improve midterm odds: Cook Political Report founder
• Now Playing5minEthics expert: President Trump spent taxpayer funds on 'political propaganda'
• Now Playing14minGov. Pritzker on Vance's midterm pitch: 'They've had too many chances already'
• Now Playing5minRep. Kamlager-Dove on growing calls for AI regulation ahead of midterms
• Now Playing8minFormer JD Vance advisor says AI fears are 'overblown'
• Now Playing2minSupreme Court rejects Trump's attempt to restrict mail-in ballots
• Now Playing10min'We should take decisive action now' on AI: Jeffries
• Now Playing4minVance and Trump speak on Night 2 of GOP's midterm convention
• Now Playing2minAmerican Univ. professor on how the RNC convention might influence midterms
• Now Playing9minRep. Madeleine Dean talks state of the Democratic party as midterms approach
• Now Playing3minTrump speaks at Republican midterm convention
• Now Playing8minRNC chair on midterm elections, first-ever midterm convention
• Now Playing7minDNC senior adviser on Trump's midterm convention
• Now Playing2minPresident's posts spark backlash