Fireworks have become a major part of the opening and closing ceremonies of recent Olympic Games and the 2014 Winter Olympics in Sochi are carrying on this tradition. The most expensive Winter Olympics to date featured a firework display containing 3500 fireworks weighing a total of 22.5 tonnes. There was a technical early glitch however, when one of five illuminated snowflakes which were to change in to the five Olympic rings failed to light.
A video of the display can be seen on the BBC Winter Olympics web page:
https://www.bbc.co.uk/sport/0/winter-olympics/26086214
