Enormous Submarine
In 2013, the Isaac Peral was designed to be the first diesel-electric submarine, but there was a major setback when it was discovered that an engineer placed a decimal point in the wrong spot during the design stages of the project. As a result, the submarine was 70 tons overweight, so the engineers had to go back to the drawing board and add an extra six meters of length to the ship’s hull to keep it from sinking all the way to the ocean floor. This redesign ended up costing $11.4 million, too.