Titanic expert Bob Ballard reacts to 'catastrophic implosion' of missing submersible

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Titanic submersible: search for missing tourist sub reaches critical stage

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Titanic submersible: search for missing tourist sub reaches critical stage
'Debris field' discovered within search area of missing submersible near Titanic wreck
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Titanic submersible: Coast Guard gives update on missing Titanic tourist sub
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Missing Titanic tourism sub has run out of oxygen, estimations suggest

Titanic expert Bob Ballard reacts to ‘catastrophic implosion’ of missing submersible