shelter building

I'm planning a build and I'm looking for two bits of advice, maybe 3, Im planning this shelter be underground,would the groung hold with supports if I use a mining method. Or am I better using an open method and make a roof that can be walked over. Also either method what do I have to worry on...

I’ve been whatching a lot of how to videos and they use a lot of bamboo and was wondering what the uks best equivalent especially strength wise

I am seriously considering making a tipi of fairly traditional design and am wondering, if I do not have access to Lodge Pole Pine (which I don't) and I only have common UK woods to choose from, what wood from the following list would be suitable for making 14ish foot long tipi poles from...

(Did a search, but it turned up nothing.) Fella over there in the UK, Kevin Langan, is planning to construct 100 primitive shelters. I’m intrigued enough to swing by there every so often to see what he has come up with. 100 Wild Huts

looking for woodland to use in north west around lanc's area and wales anyone got any contacts