Company`s Samardung Tunnel project - incident update

CIN: L99999MH1949PLC007039 July 21, 2026 Bombay Stock Exchange Ltd., The National Stock Exchange of India Ltd. Phiroze Jeejeebhoy Towers, Exchange Plaza, Dalal Street, Bandra-Kurla Complex, Mumbai - 400 001 Mumbai - 400 051 Company Code No. 531120 Company Code: PATELENG Dear Sir/Madam, Sub: Company’s Samardung Tunnel project – incident update We regret to inform you that: - An incident occurred at the Samardung Tunnel project in North Sikkim following a gas leak in the tunnel at around 1:00 PM on 20th July 2026 in Adit-3 - Face 4B Tunnel of the Project, trapping 25 project personnel with certain casualties. - The incident involved sudden release of suspected methane gas embedded / trapped in the rocks resulted in a gas burst/explosion inside the tunnel, generating dense fumes and toxic gases. - Our project team is working in close coordination with the district administration, National Disaster Response Force (NDRF), State Disaster Response Force (SDRF), local authorities and other emergency agencies to support the ongoing rescue operations. - Detailed investigation will be undertaken to ascertain the cause of the incident. In this hour of grief, our thoughts and prayers are with the bereaved families and we stand by them firmly during this difficult time. Kindly take the aforesaid on record. Thanking you, Yours faithfully For Patel Engineering Ltd. Shobha Shetty Company Secretary Membership No. F10047 REGD. OFFICE: Patel Estate Road, Jogeshwari (W), Mumbai – 400 102. India Phone +91 22 26767500, 26782916 Fax +91 22 26782455, 26781505 Email headoffice@pateleng.com Website www.pateleng.com