Why is it that my stray kitten keeps running away?

This kitten I found in my garden kesp running away and into this specific hole in the retaining wall behing my house! It worries me sometimes as the hole is only big enough for it to go in one way and it has to reverse out! Is a kittens sense of smell acute enough to enable it to come back to my house? It has done this a few times but out of those times I had to coax it out of the hole!