'Do it again!' Cooling towers destroyed in unison

Cooling towers at a coal power station in Florida have been spectacularly destroyed in unison.

The twin cooling towers at the St Johns River Power Park at Jacksonville imploded in just 12 seconds, leaving a cloud of dust.

More than 680kg of dynamite and 3.6km of detonation cord were used to bring down both towers simultaneously. The prep work for the implosion took 10 weeks to complete.

Ten weeks of preparation culminated with the simultaneous implosion of both towers, bringing 90,000 of concrete and almost 3600 tonnes of reinforcing steel rods to the ground.

From the crowd a child reportedly called out, "Do it again."

Together, they are the second-largest structures of their kind to be imploded in the United States.

CBS / Newshub.