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NOVA | Promotion | Why Ships Sink Preview

Twenty million passengers embark on cruises each year, vacationing in deluxe "floating cities" that offer everything from swimming pools to shopping malls to ice skating rinks. And the ships just keep getting bigger: The average cruise ship has doubled in size in just the last ten years. Some engineers fear that these towering behemoths are dangerously unstable.

S39 E11 | 0:00:30 | AIRED: 9/18/2013 |
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