The diagram illustrates the process of constructing an igloo from compacted snow, starting from cutting snow blocks to completing the final structure with a smooth snow layer.
Overall, the process consists of several stages, beginning with preparing snow blocks and ending with sealing the igloo to ensure insulation. The key steps involve shaping, stacking, and smoothing the snow to create a stable and enclosed dome.
Initially, blocks of hard snow are cut from the ground using a snow saw. These blocks are then arranged in a circular pattern to form the base of the igloo. Each subsequent layer is placed on top in a slightly inward-sloping manner, allowing the structure to curve naturally into a dome. A specially shaped block is used to close the top opening, making the roof secure.
Next, a hole is dug near the base to create the entrance. The builder then covers any remaining gaps or cracks between blocks with snow to prevent air from escaping. Finally, soft snow is spread evenly over the outer surface to strengthen and insulate the igloo, keeping the interior warm.