The third stage of Agni-5 is tiny and sits in the conical section under the warhead. New propellant will increase range but not much.+to avoid upsetting many friendly nations in the neighborhood. Agni-V if launched from the southern tip of India still will be able to strike Bejing and other major cities of china with a lighter payload and the need for longer-range land-based missiles also has been diminishing
— Aerodynamics🇫🇷 (@AeroResearch1) April 28, 2020+India’s first ICBM for its underwater nuclear submarine force and according to media reports DRDO has been given clearance to also start work on the K-6 SLBM which will be India’s first SLBM with MIRVs capabilities. There have been unverified news also that the DRDO is also been
— Aerodynamics🇫🇷 (@AeroResearch1) April 28, 2020+missile system and also to sustain a better burn rate in flight. Agni V-A which is reported to be a derivative of the Agni-V is expected to feature MIRVs capabilities with improved range.
— Aerodynamics🇫🇷 (@AeroResearch1) April 28, 2020

The cable runners represent the actual stage size.
Third stage is tiny.
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