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the igloo can collapse but if you reinforce the wall with a bit of water which will freeze later.... it's safer. Same process like you do with sand castle but it's bit tricky because it doesn't always freeze and there is sun which can weaken it.
the natives don't do this because the snow up there is as solid as brick and the temperature is god-forbidden cold but in here..... it doesn't have same condition as up there so you might want to take some precautionary measure if your igloo is pretty big but I'm sure it'll be ok. no biggie.
I kept pouring water on it to make it very solid on the outside. However, the inside is pretty soft so wait and see. thanks!