What this USV possibly looks like under the drape:
INS Dunagiri (the 5th Nilgiri-class firgate), INS Sanshodhak (the 4th & final Sandhayak-class survey ship) and INS Agray (the 4th Arnala-class ASW craft & the 5th overall of the ASW-SWC order) seen together at GRSE, Kolkata prior to commissioning on 21 June:
The 4 x ships of the new 3300-ton Sandhayak-class were built under Survey Vessel (Large) or SV(L) program to replace 8 x of the original 1900-ton Sandhayak-class built in the 1980s, 3 x of which have already been decommissioned.
6 x more survey ships are to be procured under the upcoming Next-Gen Survey Vessel (NGSV) program, so these 10 x surveyors will form the core of the fully renewed hydrographic fleet.