Im new here so let me start off by saying hi, i usally use the datacity foruns but you guys look like history buffs. I went by a house and took a personal tour in indian village and the lady there showed me an underground tunnel, that was sealed off, that she said lead to the detroit river. When i was looking at homes i saw a tunnel under the ones on grand blvd that lead from one house to another. So my question, not being a detroit native, is this common?