Baltimore bridge collapse would have been much worse if the ship hadn't called in 'mayday'

• The cargo ship that crashed into the Baltimore bridge called in a 'mayday' moments before. 
• Thanks to the distress call, officers stopped traffic to the bridge, Maryland Gov. Wes Moore said.
• Moore said the call saved lives.

The Baltimore bridge collapse could have been deadlier had the crew of the swerving cargo ship not called in a "mayday" before hitting the bridge's support.