Alex Pireson speaks with Sal Mercogliano, Maritime historian with Campbell University and former merchant mariner and host of ‘What's Going On With Shipping?’ on YouTube, about a cargo ship that lost power and rammed into a major bridge in Baltimore early Tuesday, destroying the span in a matter of seconds and plunging it into the river in a terrifying collapse that could disrupt a vital shipping port for months. Six people are missing and presumed dead. But what happens onboard the ship when everything goes dark?

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