Baltimore Key Bridge collapse: Temporary channel opens for boats working on bridge response

Imagery from underwater drones show "an abundance of twisted metal and debris" from the collapsed bridge, making it unsafe for divers to enter the frigid water to search for the six missing construction workers, according to a new assessment of the situation from the Department of Homeland Security obtained by ABC News.

One truck and trailer have been recovered, and one vehicle remains hanging from the metal structure, according to DHS.

The 23 ship crew members are all accounted for, and one was transported to a local hospital with a minor injury, the document said.

With the Port of Baltimore closed to maritime traffic, transportation officials expect backups to rail and truck freight shipments as cargo shifts along the eastern seaboard, the document said.

Investigators have determined there are 13 damaged containers aboard the ship and they are being inspected for any potentially hazardous materials, DHS said.

"There is minor sheening on-scene. Booming has been ordered and is staged but will not be placed until search and rescue and dive operations are complete," the document said. "The amount of potential oil spill is 1.8M gallons of marine grade diesel."

-ABC News’ Josh Margolin and Aaron Katersky

National Transportation Safety Board investigators are combing on Wednesday through a voyage-data recorder in an attempt to recreate a timeline of Tuesday's cargo-ship crash, Jennifer Homendy, NTSB chairwoman, said Wednesday.

“We do have a download from the voyage data recorder that we've sent back to our lab to evaluate the data and begin to construct a timeline of events, which we hope to have later today,” Homendy said on “Good Morning America.”

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NTSB chairwoman discusses Francis Scott Key Bridge investigationJennifer Homendy says that the bridge was rated as "satisfactory" during the last inspection in May 2023 by the Federal Highway Administration.

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NTSB investigators, who are leading the investigation, arrived at the bridge scene at 6 a.m. on Tuesday. Twenty-four NTSB staffers were on site, including several specialising in nautical operations, human performance and engineering, Homendy said Tuesday.

She said on Wednesday that those investigators were expected later in the day to board Dali, the vessel that crashed into the bridge.

“We aren't looking at the structure today,” she said, meaning the fallen bridge. “We will be boarding the vessel at some point today to begin to look at the devastation really, and then look through the vessel itself. “

Investigators were busy working on Wednesday to discover what caused the power loss prior to the crash, but the full investigation and repair efforts will take "not days, weeks nor even months," Maryland Gov. Wes Moore said on Wednesday.

"This is complicated. It is difficult. But we still have to be able to move with a sense of urgency and we are going to get it done. But this is going to take time," Moore said in an interview on "Good Morning America." "This is not days, weeks nor even months."

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Maryland governor on recovery efforts after Francis Scott Key Bridge disasterGov. Wes Moore joins “GMA” to share what he knows about the cargo ship that collided with the bridge, the plan to rebuild and efforts made by first responders to save lives after the disaster.

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"We still have information that we have to uncover," he said, "The thing that we do know though is that with a ship of that size, moving at that kind of clip, it was going to be difficult for that type of bridge to be able to sustain."

Moore and other government officials had met on Tuesday with the families of the missing, as the search continued.

"Had the opportunity to pray with them and pray for them," he said Tuesday. "And the strength of these families is absolutely remarkable, and we want to let them know that we are here with you every single step."

He said investigators would do everything they could to give those families peace as the search turns to a recovery mission.

"We want to let them know we will use all resources to bring them a sense of closure and peace," he said on "GMA."

The force with which a cargo ship hit Baltimore's Key Bridge on Tuesday was "just unimaginable," Transportation Secretary Pete Buttigieg said Wednesday.

"What I do know is that the force of this ship is almost unimaginable," Buttigieg said on "Good Morning America." "This is a vessel that was about 100,000 tons carrying its load. So 200 million lbs. went into this bridge all at once, which is why you had that almost-instant catastrophic result."

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Sec. Buttigieg gives update on Francis Scott Key Bridge collapse investigationTransportation Secretary Pete Buttigieg shares the latest details about the investigation into the Baltimore bridge disaster and the timeline for recovery and rebuilding.

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As the U.S. works to update bridges around the country, each new generation of bridges is "more resilient than the last," Buttigieg said.

"We are at work to make sure our infrastructure for the future is better prepared for any kind of threat," he said. "Really what we saw yesterday was just unimaginable in terms of the proportion of that ship."

Buttigieg had arrived at the scene in Baltimore on Tuesday, saying at the time that the DOT's Maritime Administration would assist with disrupted port, harbor and supply chain operations.

The DOT's Federal Highway Administration will assist with the bridge, he said Tuesday.

He said his "first thoughts" were with the missing construction workers and their families.

"Now they are dealing with news that's just unthinkable," he said on "GMA."