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How to free the submarine crew in an emergency?German submarine explosion: Mysteriously challenging the maritime industry for nearly 100 years
Nearly 100 years after the horrifying German submarine accident, UB-65 became the leading name in the world's largest mystery series.
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Can carp live 10 years in a tank without feeding?
Why do Italy and Switzerland have to redraw the border?
Japanese bullet train accident-free for 60 years
The world's most crowded apartment building: Can accommodate up to 30,000 people, the view inside is overwhelming
World's oldest wine jar contains cremated human bones
America catches strange signal from 1.3 billion light years away from Earth
Two black holes closest to Earth discovered, of a kind never seen before
Solar sails help spacecraft reach Mars in 26 days
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