1. Mahanadi Basin: ONGC’s First Deepwater Well Under Samudra Manthan
- ONGC started drilling MN-DW18-1-H-D, its maiden deepwater exploratory well, off the Mahanadi coast on 25 July 2026.
- Hardeep Singh Puri, Petroleum Minister, spudded it by video link from New Delhi.
- It opens the deepwater phase of the Samudra Manthan Mission, which followed PM Modi's 15 August 2025 speech.
- The Mahanadi starts in Chhattisgarh and ends near Paradip.