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The map marker provides an entrance to the Mass Pike Tunnel.
Mass Pike Tunnel West is the westbound section of the highway connecting to the Mass Pike Interchange. Numerous ruined vehicles lay on the highway.
A group of raiders have built an encampment near the entrance, allowing access from the upper roadway down. It is here where the Sole Survivor uses Dogmeat to track Kellogg. A bloodied rag lays nears the stair access on the other side of the highway.
The Mass Pike Tunnel West appears only in Fallout 4.
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