How do you make the chimney?

To create a hole (chimney) in the top of the ice globe, place it over a candle with plenty of air flow from underneath. Because the interior cavity is basically round, the melting ice will follow the contour of the cavity and not put the candle out. So the heat of the candle will create the hole.

For a faster method, use a cordless drill (preferably 18 or 20 Volt) and the largest drill bit (a 1" bit for small globes and and 1.5" bit for large globes) to create a chimney. It is recommended that this option be completed by an adult wearing safety glasses.

The best drill bit is often called a Spade Bit and it comes in many different diameters. 

While cracks in the ice can often be beautiful, too much pressure can break a globe in half. With a good sharp drill bit and a powerful drill, it should not be necessary to apply too much pressure. Let the drill bit do the work.

Remember that ice is slippery, keep your hands at a safe distance and start drilling slowly until the bit grabs the ice.