This document discusses the transformation of underbridge spaces in Beirut into public spaces. It analyzes different bridge typologies in Beirut and categorizes them based on their relationship to surrounding communities and uses. The Yerevan Bridge is identified as having characteristics of both the "informal transportation hub" and "green unused space" typologies. The document proposes a concept of a "hybrid infrastructure system" to connect the bridge space to its context and create a walking experience under the Yerevan Bridge.