How would you go about making a dugout shelter that isn't a complete clickbait "youtube-tier" meme?

Something that will last, not turn into a flooded hole in the ground, or rot quickly?

I've considered lots of materials and techniques, from using bricks and cement, to welding a metal arched frame, to just going primitive with burnt logs.

How would you do it? Want to make my outdoor retreat and cabin a reality, but don't want to impact the landscape by making a big building above ground. Looking to build small and cozy.

Want to bury it into the hillside like a nice Hobbit hole, and am willing to construct with quality materials and take my time.