Crews set off a chain of carefully placed explosives Monday to break down the largest remaining span of the collapsed Francis Scott Key Bridge in Baltimore, and with a boom and a splash, the mangled steel trusses came crashing down into the river below.
The explosives flashed orange and let off plumes of black smoke upon detonation. The longest trusses toppled away from the grounded Dali container ship and slid off its bow, sending a wall of water splashing back toward the ship.
It marked a major step in freeing the Dali, which has been stuck among the wreckage since it lost power and crashed into one of the bridge’s support columns shortly after leaving Baltimore on March 26.
The collapse killed six construction workers and halted most maritime traffic through Baltimore’s busy port. The controlled demolition will allow the Dali to be refloated and restore traffic through the port, which will provide relief for thousands of longshoremen, truckers and small business owners who have seen their jobs impacted by the closure.
Officials said the detonation went as planned. They said the next step in the dynamic cleanup process is to assess the few remaining trusses on the Dali’s bow and make sure none of the underwater wreckage is preventing the ship from being refloated and moved.
“It’s a lot like peeling back an onion,” said Lt. Gen. Scott Spellmon of the U.S. Army Corps of Engineers.
Officials expect to refloat the ship within the next few days. Then three or four tugboats will guide it to a nearby terminal at the port. It will likely remain there for a several weeks and undergo temporary repairs before being moved to a shipyard for more substantial repairs.
“This was a very big milestone for our progression forward,” Col. Estee Pinchasin, Baltimore District Commander for the Army Corps of Engineers, said in the immediate aftermath of the demolition. She said crews don’t anticipate having to use any more explosives.
The Dali’s crew remained on board the ship during the detonation, and no injuries or problems were reported, said Capt. David O’Connell, commander of the Port of Baltimore.
The crew members haven’t been allowed to leave the grounded vessel since the disaster. Officials said they’ve been busy maintaining the ship and assisting investigators. Of the crew members, 20 are from India and one is Sri Lankan.
Engineers spent weeks preparing to use explosives to break down the span, which was an estimated 500 feet (152 meters) long and weighs up to 600 tons (544 metric tons). The demolition was postponed Sunday because of thunderstorms.
“This is a best practice,” Gov. Wes Moore said at a news conference Monday, noting that there have been no injuries during the cleanup to date. “Safety in this operation is our top priority.”
Fire teams were stationed in the area during the explosion in case of any problematic flying sparks, officials said.
In a videographic released this week, authorities said engineers were using precision cuts to control how the trusses break down. They said the method allows for “surgical precision” and is one of the safest and most efficient ways to remove steel under a high level of tension. Hydraulic grabbers will now lift the broken sections of steel onto barges.