A large hole has appeared on the local roadway of Tsarigradsko Shose Blvd. in Sofia, from the direction of the St. Anna University Hospital.
Traffic on one lane of the roadway has been temporarily stopped. Engineers from the Municipality's Public Works Department and Metropolitan were sent to the scene.
The section has been secured and will be reinforced.
The likely cause of the collapse is the construction of a subway tunnel, the presence of weak bulk soils and reduced pressure in the tunnel boring machine's face chamber, the Sofia Municipality announced.