How do you strengthen an igloo?

1. compress snow so it is very hard

2. saw it into bricks, and also 2 flat slabs and a round block (to seal the top)

3. wedge the 2 flat slabs in an upside down v shape (the entrance)

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4. lay a ring of ice bricks in a circle

5. lay more bricks on top, building it up in a spiral formation

6. put a round block of ice in the hole at the top of the igloo (try testing it and adjusting the size)