Fridge maker Beko is urging customers to slip a piece of A4 paper into their fridge this week while the weather is still hot.

And a computer simulation also suggests that punctures in the hull the size of A4 pieces of paper led to the ship's demise.

Step 1: Get an A4 piece of paper, origami paper can help make things easier, but it's not essential. Fold the bottom left corner over to the top right corner, making a pointed triangular shape.