The commercial-cum residential complex building in Shenoy Nagar here houses six shops and two houses.
"We were stunned by a thud sound late last night and found that the steps leading leading to our building had sunk in," a resident of the building, K Arumugam, told PTI.
At a meeting today, Metro Rail officials promised to undertake repair works. However, this has caused a scare, he said.
Cross passages are created as a link between the two tunnels for evacuation of passengers during an emergency. Such passages also provide access to one tunnel through the other for maintenance employees.
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Stating that such "minor" incidents had been reported even before during underground work between Washermanpet and High Court area, he said the "defect will be rectified."
The network is expected to be inaugurated between Alandur and Koyambedu soon.