<instructions>Your goal is to analyze the following comment and estimate how highly it will be upvoted by the Hacker News community.</instructions><comment><author>semi-extrinsic</author><text>Throwback to the scene in The Day After Tomorrow where the cargo ship comes to an almost instant halt after impacting a bus wreck under water. For some reason it managed to stand out as ridiculous even in that movie.</text><parent_chain><item><author>hgfghj</author><text>That ship had a 10,000 TEU capacity and was actually hauling a little under 5,000 TEUs.  An empty container weighs a little over 5,000lbs, and a full one can be up to 67,000lbs.&lt;p&gt;If you do the math, you find that it’s just an astronomical amount of momentum, and there’s no effective defense for a bridge that needs support in more than 30 or so feet of water.</text></item><item><author>bastardoperator</author><text>The video is surreal, it looks like it barely bumps the bridge and 2 seconds later the entire thing is gone. I don&amp;#x27;t know what I was expecting, the bridge just looked extremely fragile, makes me wonder what other bridges are at risk of an event like this.</text></item><item><author>paddy_m</author><text>Youtube tracking analysis from a knowledgeable mariner.&lt;p&gt;He says that at about 1:24 AM the ship loses power (from video feed) while traveling 8.5 knots.&lt;p&gt;at 1:25.30 power is restored.&lt;p&gt;at 12:25.59 the ship shows smoke.  The ship has already drifted in the channel. It is believed that at this time the ship applied full reverse power as evidenced by the black smoke. (My analysis: the ship drifted but hasn&amp;#x27;t turned in the channel, more of a translation)&lt;p&gt;By 1:26.45 the ship has obviously turned in the channel pointing at the pier.  Full reverse would cause prop walk to change heading angle;&lt;p&gt;1:28.52 impact at 7.6 Knots.  Camera says 1:28.52, AIS reports the ship still moving at 1:29:35&lt;p&gt;&lt;a href=&quot;https:&amp;#x2F;&amp;#x2F;www.youtube.com&amp;#x2F;watch?v=N39w6aQFKSQ&quot; rel=&quot;nofollow&quot;&gt;https:&amp;#x2F;&amp;#x2F;www.youtube.com&amp;#x2F;watch?v=N39w6aQFKSQ&lt;/a&gt;</text></item></parent_chain></comment><story><title>Baltimore&apos;s Key Bridge struck by cargo ship, collapses</title><url>https://www.wbaltv.com/article/baltimore-bridge-collapse-key-bridge/60303975</url></story>
<instructions>Your goal is to analyze the following comment and estimate how highly it will be upvoted by the Hacker News community.</instructions><comment><author>HarryHirsch</author><text>&lt;i&gt;there’s no effective defense for a bridge that needs support in more than 30 or so feet of water&lt;/i&gt;&lt;p&gt;You put in sheet piling 50 meters upstream, and you fill the box with rocks. That&amp;#x27;s state of the art practice, nowadays, but that bridge was 50 years old.</text><parent_chain><item><author>hgfghj</author><text>That ship had a 10,000 TEU capacity and was actually hauling a little under 5,000 TEUs.  An empty container weighs a little over 5,000lbs, and a full one can be up to 67,000lbs.&lt;p&gt;If you do the math, you find that it’s just an astronomical amount of momentum, and there’s no effective defense for a bridge that needs support in more than 30 or so feet of water.</text></item><item><author>bastardoperator</author><text>The video is surreal, it looks like it barely bumps the bridge and 2 seconds later the entire thing is gone. I don&amp;#x27;t know what I was expecting, the bridge just looked extremely fragile, makes me wonder what other bridges are at risk of an event like this.</text></item><item><author>paddy_m</author><text>Youtube tracking analysis from a knowledgeable mariner.&lt;p&gt;He says that at about 1:24 AM the ship loses power (from video feed) while traveling 8.5 knots.&lt;p&gt;at 1:25.30 power is restored.&lt;p&gt;at 12:25.59 the ship shows smoke.  The ship has already drifted in the channel. It is believed that at this time the ship applied full reverse power as evidenced by the black smoke. (My analysis: the ship drifted but hasn&amp;#x27;t turned in the channel, more of a translation)&lt;p&gt;By 1:26.45 the ship has obviously turned in the channel pointing at the pier.  Full reverse would cause prop walk to change heading angle;&lt;p&gt;1:28.52 impact at 7.6 Knots.  Camera says 1:28.52, AIS reports the ship still moving at 1:29:35&lt;p&gt;&lt;a href=&quot;https:&amp;#x2F;&amp;#x2F;www.youtube.com&amp;#x2F;watch?v=N39w6aQFKSQ&quot; rel=&quot;nofollow&quot;&gt;https:&amp;#x2F;&amp;#x2F;www.youtube.com&amp;#x2F;watch?v=N39w6aQFKSQ&lt;/a&gt;</text></item></parent_chain></comment><story><title>Baltimore&apos;s Key Bridge struck by cargo ship, collapses</title><url>https://www.wbaltv.com/article/baltimore-bridge-collapse-key-bridge/60303975</url></story>