Preparations for the festival begin about a week before opening night. Workers use large saws to cut giant blocks of ice from frozen lakes near Finse. Each block weighs about 1,600 kilograms (3,527 pounds)!
Carving each instrument can take up to 12 hours, says Bill Covitz. He’s an ice carver from Connecticut who helps with the festival almost every year. To start an instrument, Covitz cuts the rough shape with a chainsaw. He uses smaller tools, like chisels, to shape finer details. Carvers work outside, where the air is usually about -7°C (19°F) in the winter. That’s well below water’s freezing point of 0°C (32°F).
To hollow out a horn, Covitz slices a piece of ice down the middle. Then he carves a groove in each half for the musician to blow through. Finally, he puts the halves together and sprays them with water. The water quickly freezes solid, sticking the two halves in place.