BALTIMORE (AP) — The U.S. Justice Department on Wednesday sued the owner and manager of the cargo ship that caused the Baltimore bridge collapse, seeking to recover more than $100 million that the government spent to clear the underwater debris and reopen the city’s port.

The lawsuit filed in Maryland alleges that the electrical and mechanical systems on the ship, the Dali, were improperly maintained, causing it to lose power and veer off course before striking a support column on the Francis Scott Key Bridge in March.

“This tragedy was entirely avoidable,” according to the lawsuit.

The collapse snarled commercial shipping traffic through the Port of Baltimore for months before the channel was fully opened in June.

“With this civil claim, the Justice Department is working to ensure that the costs of clearing the channel and reopening the Port of Baltimore are borne by the companies that caused the crash, not by the American taxpayer,” Attorney General Merrick Garland said in written statement.

The case was filed against Dali owner Grace Ocean Private Ltd. and manager Synergy Marine Group, both of Singapore. The companies filed a court petition days after the collapse seeking to limit their legal liability in what could become the most expensive marine casualty case in history.

The ship was leaving Baltimore bound for Sri Lanka when its steering failed because of the power loss. Six members of a road work crew on the bridge were killed in the collapse. The men were working an overnight shift filling potholes on the bridge deck when it suddenly crumbled beneath them, sending them tumbling into the water.

“This accident happened because of the careless and grossly negligent decisions made by Grace Ocean and Synergy, who recklessly chose to send an unseaworthy vessel to navigate a critical waterway and ignored the risks to American lives and the nation’s infrastructure,” said Chetan Patil, the acting deputy assistant attorney general.

On Tuesday, the victims’ families declared their intent to file a claim seeking to hold the ship’s owner and manager fully liable for the disaster. Several other interested parties, including city officials and local businesses, have filed opposing claims accusing the companies of negligence.

The families are also calling for more robust workplace protections, especially for immigrant workers. All the victims were Latino immigrants who came to the United States in search of better-paying jobs and opportunities.

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Richer reported from Washington.