India has issued Notices to Airmen (NOTAM) for a launch of an experimental flight vehicle in the Bay of Bengal for the period from 5-9 Oct 2023 as per information provided by Twitter user Damien Symon@detresfa
The designated area for the NOTAM is 2000 km in length which indicates of a likely missile test.
Sources – S-400 COMPETITOR INDIA’S HOMEGROWN LRSAM WHICH CAN TIP THE BALANCE OF POWER IN THE REGION