Engineering is a precise art. One error and the consequences could be disastrous, in some cases even deadly. There have been plenty of engineering errors throughout history, all of them serving a grim lesson in why structuring a building, ship or vehicle properly is of the utmost importance.

Without further ado, here are the top 3 engineering errors ever made by man.

1. Titanic

The doomed voyage of the RMS Titanic back in 1912 has since become legendary ever since the boat sank after being hit by an iceberg. And yet, many would have you believe before the ill-fated vessel left shore from Southampton that it was an “unsinkable” ship.

In theory, it was supposed to be but in practise not so much, as history has taught us. Many factors led to the Titanic sinking, from half the lifeboats being removed to cruising at speed in an iceberg field.

Recent excavations however prove that the 3 million rivets made to hold the ship together were made from an incredibly low-quality iron, making it all the easier for the ship to be torn apart. So much for unsinkable.

2. Leaning Tower of Pisa

Everyone’s favourite building to pose in front of, the Leaning Tower of Pisa is world renowned for its absurd angle. For over 800 years, the tower has slowly been sinking into the ground, giving the impression that it will topple over at any second.

The error here was the foundation which was made of mud, sand and clay. Ever since 1838, it has slowly been leaning further and further to the side. You can no longer enter the tower but it’s worth a visit if you’re in Tuscany.

3. Chernobyl

In the early hours of 26th April 1986, a structurally unsound reactor in Chernobyl Nuclear Power Plant near Pripyat in Ukraine in the Soviet Union exploded, causing massive amounts of radiation to pour into the atmosphere. Ever since, the town of Pripyat has been deserted, the land around it poisoned by the radiation.

The error cost hundreds of thousands of people to flee the area and the radiation reached far and wide. All of this because a safety procedure went wrong and all because the reactor was not built properly.

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