Dive summary:

• The Port of Tampa wanted to get three 150-foot concrete silos and an 180-foot concrete grain elevator – all unused – out of the way, but the presence of tanks of combustible fuel and the associated risk of air or water contamination from any debris-induced leak ruled out wrecking balls and explosives.
• Kimmins Contracting and its sub, True-Line Coring and Cutting, instead used Brokk robotic machines, wearing "safety harnesses" attaching them to cranes, to demolish the structures from the roof down.
• The remotely controlled machines were lifted to the tops of the structures and removed the roofs on which they sat – hence the crane connections – while workers ran them from a safe distance away, then the walls could be gradually knocked into the structures and hauled away through holes sawed in the walls first.

From the article:

“The Brokk was powerful enough to break up the tough concrete, yet light and compact enough to rest on each surface and perform the demolition in tight quarters,” [True-Line's Tampa president, Matt] Alexander said.