Baltimore's Francis Scott Key Bridge Collpase

How Baltimore Bridge is Collpased
The vessel, the Dali, left port at 12:39 a.m. Tuesday and, after it entered the channel, signs of trouble came at about 1:25 a.m. when numerous alarms sounded, according to the NTSB. About a minute later, steering commands and rudder orders were issued, and at 1:26 a.m. and 39 seconds, a pilot made a general radio call for nearby tug boats.
Maryland Transportation Authority data from about the same time shows the pilot association dispatcher called the transportation authority’s officer on duty about the blackout, the NTSB said.

Just after 1:27 a.m., the pilot commanded the ship to drop an anchor on the left side of the ship and issued added steering commands. About 20 seconds later, the pilot issued a radio call reporting that the Dali had lost all power approaching the bridge.

At about that time, the state transportation officer on duty radioed two of its units already stationed at each end of the bridge saying to close the bridge to vehicle traffic. They were already there because of the construction.

Around 1:29 a.m., when the ship was traveling at about 8 mph (13 kph), recordings for about 30 seconds picked up sounds consistent with it colliding with the bridge, the NTSB said. A Transportation Authority dash camera also shows lights on the bridge going out.

At 1:29 a.m. and 39 seconds, the pilot reported to the Coast Guard that the bridge was down.