rangoon03 t1_iyea3cv wrote
Reply to comment by DocAuch22 in Where do the emergency exits in the Squirrel Hill tunnel come out? Wouldn’t they have to be In people’s backyards? by sqqueen2
Its the ventilation system: https://www.brooklineconnection.com/history/Gallery/Tunnels.html#14
Plastic-Relation6046 t1_iyes9gf wrote
I only learned this a few years ago.....so interesting always wondered what those were!
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