How the controlled demolition of the Key Bridge will work 

It only took a few seconds for the ship to take down the key bridge, and now it'll only take a few seconds to remove the steel truss resting on its deck. "Precision pressure charges," a type of explosive, will do the job. The Unified Command says this is an industry-standard practice, and is the safest and fastest way to get that piece of the bridge off the Dali. The steel is under a "tremendous amount of pressure and tension," meaning, if crews themselves were to make the final cuts, the steel could bounce back like a spring.
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