re: Are these indicators of moles?

While we are talking about Moles I have a question. Never had moles, that I know of in my yard. I recently re sodded my back yard after I completed my pool. A couple weeks later I found a small mole floating dead in my pool. It’s been a mystery since and for some reason I still think about it. Is it possible that he came in the sod. How deed do they usually dig. Seems like it would be too shallow for him to come in the sod.