The Key Bridge in Baltimore has essentially totally collapsed after being hit by a container ship.
The current estimate is that 20 construction workers and 3-4 civilian vehicles were on the bridge when it collapsed. RIP to those who didn’t make it. Here’s a photo of the aftermath.
The ship was reportedly a Singaporean-flagged container ship named Dali. I would assume this is an accident, although a deliberate attack can’t be ruled out. People have noticed that lights are going on and off on the bridge of the ship as it approaches the bridge, so maybe it was having technical issues.
Not on fire, but in this video you can see it billow black smoke out of its funnel and then lose a bunch of the lighting, so it definitely looks like something was amiss.
By “bare steerageway” is meant how fast a ship has to be travelling before you can steer it from the helm. If it’s below that speed there just isn’t enough water pressure on the rudder to turn the ship.
It’s hard to have good intuitions about this because these things are so unfathomably heavy. Like you would think that at 4 mph or less, how can it do so much damage, but it could well weigh in excess of 200,000 tons.
The only thing we know for certain at this point is that over the next 24 hours hundreds of experts on bridges & container ships will come out of the woodwork and make their presence known on Twitter.
Not that I think it’s some conspiracy, but not being a structural engineer, one of my first thoughts here was I didn’t think a slow-moving ship hitting a bridge stanchion would completely bring it down.