underground spaces

i’m currently working on a project dealing with design and architecture in underground spaces. Can anyone give me suggestions on current projects they’ve heard/read of??? I’m open to any info you have. Thanks!

There is a decent amount about earth berm and underground houses in this book:


Plus its really funny.

watch carefully and u will find many special element
all that element will be used in your design
of course your imagination is necessary too
good luck