Baltimore bridge collapse: What happened and what is the death toll so far?

March 27 (Reuters) - Baltimore's Francis Scott Key Bridge collapsed on Tuesday after a container ship smashed into a pylon, with the six people missing presumed dead after falling into the frigid water below. Authorities stopped people from using the bridge after the ship sent out a mayday call, saving lives.

Rebuilding the bridge could cost $600 million and it may be some time before Baltimore's port can reopen, according to initial estimates.

Shortly after 1 a.m. ET (0500 GMT), a container ship named the Dali was sailing down the Patapsco River on its way to Sri Lanka. At 1:24 a.m., it suffered a total power failure and all its lights went out.

Three minutes later, at 1:27 a.m., the container ship struck a pylon of the bridge, crumpling almost the entire structure into the water.

The bridge was up to code and there were no known structural issues, Maryland Governor Wes Moore said.

Tuesday's disaster may be the worst U.S. bridge collapse since 2007, when a design error caused the I-35W bridge in Minneapolis to plunge into the Mississippi River, killing 13 people.

Six people are missing, and rescuers have lost hope of finding survivors. The six presumed dead include workers from Mexico, Guatemala and El Salvador, according to the Mexican Consulate in Washington.

Efforts have switched to looking for bodies in the 50-foot-deep waters surrounding the twisted ruins.

At the time of the crash, a construction crew was fixing potholes on the bridge and eight people fell 185 feet (56 meters) into the river where water temperatures were 47 F (8 C). Two workers were rescued, one unharmed and one injured.

According to research for the Federal Aviation Administration, that is the upper limit of what a human could survive falling into water.

Authorities saved lives by stopping vehicles from using the bridge after the ship sent out a mayday call, the Maryland governor said.

The ship also dropped its anchors to slow the vessel, giving transportation authorities time to clear the bridge.

The metal truss-style bridge has a suspended deck, a design that contributed to its collapse, engineers say. The ship appeared to hit a main concrete pier, which rests on soil underwater and is part of the foundation.

President Joe Biden promised to visit Baltimore soon and said he wanted the federal government to pay to rebuild the bridge.

The Transportation Department can award "quick release" emergency relief funds that are typically a few million dollars. To replace the bridge, Congress would need to approve funding. After the bridge collapse in 2007 in Minnesota, Congress allocated $250 million.

Initial estimates put the cost of rebuilding the bridge at $600 million, according to economic analysis company IMPLAN.

Insurers could face billions of dollars in claims from companies due to lost business and disruptions.

Rebuilding could be a lengthy process and will depend on whether any of the remaining structure can be salvaged. It took five years to construct the original bridge from 1972-1977.

The closure of the port for just one month would cost Maryland $28 million in lost business, according to IMPLAN.

The Dali was leaving Baltimore en route to Colombo, Sri Lanka.

None of the 22 crew members were hurt, the ship's manager, Synergy Marine Group said, opens new tab.

The registered owner of the Singapore-flagged ship is Grace Ocean Pte Ltd, LSEG data show. The ship measures 948 feet (289 meters) — as long as three football fields placed end to end. It was stacked high with containers but was capable of carrying twice as much cargo. Safety investigators recovered the ship's black box, which can tell them the vessel's position, speed, heading, radar, bridge audio, and radio communications as well as alarms.

The same ship was involved in an incident in the port of Antwerp, Belgium, in 2016, when it hit a quay as it tried to exit the North Sea container terminal.

A later inspection in June 2023 carried out in San Antonio, Chile, found the vessel had "propulsion and auxiliary machinery" deficiencies, according to data on the public Equasis website, which provides information on ships.

The Francis Scott Key Bridge was one of three ways to cross the Baltimore Harbor and handled 31,000 cars per day or 11.3 million vehicles a year.

The steel structure is four lanes wide and sits 185 feet (56 meters) above the river.

It opened in 1977 and crosses the Patapsco River, where U.S. national anthem author Francis Scott Key wrote the "Star Spangled Banner" in 1814 after witnessing the British defeat at the Battle of Baltimore and the British bombing of Fort McHenry.

The 1.6-mile (2.57 km) long Francis Scott Key Bridge in Baltimore, Maryland collapsed into the water overnight after a cargo ship collided with it on March 26.

The 1.6-mile (2.57 km) long Francis Scott Key Bridge in Baltimore, Maryland collapsed into the water overnight after a cargo ship collided with it on March 26.

Traffic was suspended at the port, the 17th largest in the country, opens new tab.

The flow of containers to Baltimore can likely be redistributed to bigger ports. However, there could be major disruptions in shipping cars, coal and sugar.

It is the busiest U.S. port for car shipments, handling at least 750,000 vehicles in 2023, according to data from the Maryland Port Administration.

In 2023, the port was the second busiest for coal exports.

It is also the largest U.S. port by volume for handling farm and construction machinery, as well as agricultural products such as sugar and salt.