The photo in that tweet is the old Sandhayak class survey ships of the Indian Navy that were commissioned into service in the late 70s. A total of 8 Sandhayak class survey ships were built by GRSE for the Navy, each vessel weighing ~1930 tons. The 1st two ships of the class INS Sandhayak (J18) & INS Nirdeshak (J19) have been decommissioned recently.
The Navy sought a replacement for the Sandhayak class survey vessels so a tender for 4 new survey vessels was out in 2016. The Navy wanted the new ships to displace ~3300 tons. GRSE won that tender, thus this new class of large survey vessels were tentatively named the GRSE-class survey vessels. The design work was done by Vik-Sandvik with inputs from GRSE. The ship will see use of modular construction practices. Below you can see the new GRSE class large survey vessel's design.
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On the 5th of December 2021, the 1st ship of this class was launched. The 1st ship is named Sandhayak, using the old Sandhayak as the namesake. It is a pretty common practice for the Navy to name a new ship after an old decommissioned ship. However the new ship seems to have the same pennant number (J18) as the old one. That is not common practice, I don't know why they are doing this.
Photos from the ship launch ceremony:
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Here you can see the bow thruster. The are multiple thrusters present on the stern too:
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The helicopter bay doesn't have a door yet:
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There was a question on a different thread asking why we launch our ships before making the superstructure. That is clearly not the case here. I think it is a case specific matter. Plenty of our ships get launched with no superstructure while other ships have a lot of superstructure in place before launch.
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Have to give credit to GRSE, this ship was laid down in Nov 2019 & launched on Dec 2021. It will be commissioned by October 2022. ~3 years from laid down to in service for a 3300 ton ship during a global pandemic with all the manpower & supply chain problems. For comparison the Kamorta class ASW corvettes also weighing 3300 tons took 7-8 years to go from laid down to in service.
Naval News had an interesting tidbit. Here is the exact quote from the article:
Source:
India's First Survey Vessel (Large) Launched by GRSE - Naval News
Remember the 2016 Navy tender for the 4 large survey ships ? L&T Shipbuilding was the primary competition for GRSE. It was a closely fought competition, in the end L&T lost out by a thin margin. So why is L&T going to other 3 ships ?
Few months back GRSE was laying the keel of the 3rd survey vessel. Now what is this talk of L&T making the other 3 ships ? The only ship of this class that has not been lad down is the 4th ship.
KEEL LAYING CEREMONY FOR 1st WARSHIP OF ASW SHALLOW WATER CRAFT PROJECT AND 3rd WARSHIP OF SURVEY VESSEL LARGE PROJECT