Precautions for a subterranean level
My home is built on a slight slope and my shop (attached) is partially earth sheltered, it has about 4.5' stem walls. To ensure it was water proof, I had a contractor who specialized in this, spray the outside of the stem wall with a tar like compound and then they applied Delta Dimple Mat&quot; over that  (see link below). Then a well designed foundation drain to carry away and water that seeped thru the dimple mat. Fortunately for me, being on a slope I could simply let gravity do it's job to move the water.  Depending upon your topology, you may need to drain it to a sump basin and use a sump pump to pump it to a good location away from the building.
Sorry for the product recommendation, I try not to do that, but in this case, I think it's justified.
https://www.dorken.com/en/our-products/products/residential/delta-ms.php