Just poke a couple of breathing holes through the roof and you’re all done.
So all up you’re looking at a six hour job. It’s not easy but I got to say digging out the inside of your own “snow cave” into any style you like is really fun and exciting. It’s like sculpting your own “home” right before your eyes.
Now I just hope it snowed enough so I can build another one on the lake. Then try and find good hard snow (so far very elusive this year) so I can try building an igloo!