Cable bury

I was working in my yard planting. So I call Julie to check the area. After all the flags were in place I started my job. I was putting in a edger for the planting bed when I ran into an infinity line only two inches below my grass. I knew it was down  there but had no idea that it was that close to the surface. I cannot believe that being two inches deep could be a correct bury practice. To me it look like a half heartedly attempt at best.