How to do water proof to a basement

[Michael Stole]

This is an unfinished basement. I want to finish it to make it livable.
The basement, however, has some water damage caused by mold. I was told to do a water proof system from exterior, by digging deep around the house, which is very expensive: $50k for a 1200 square footage area.

I am wondering if there is any less costly alternative option for the water proof system? Like from interior? Thanks.