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Deep-sea explorer breaks down what banging sound could mean
Crews searching for the Titan submersible heard banging sounds every 30 minutes Tuesday and four hours later, after additional sonar devices were deployed, banging was still heard, according to an internal government memo update on the search. Deep-sea explorer David Gallo joins CNN's Alisyn Camerota to explain what the development could mean.
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CNN
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Deep-sea explorer breaks down what banging sound could mean

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