I understand that there is some actual minute possibility of 1 tunneling thing (partical? quark? light photon? I'm not sure of the terminology here...) to go right through, say, a brick wall. I have no issue with this, and can visualize it and it makes sense to me.
I'm still working on my theory that genetic information is tunneled in from a parallel universe. No quarks necessary, only digital whispers from the G dimension.