K family is a Submarine Launched Ballistic Missile (SLBM)

The missile is launched by sea to surface and sea to sea or sea to ground.

k-4 missiles

The K family of missiles named after Indian scientist and former president A. P. J. Abdul Kalam, is a series of submarine-launched ballistic missiles (SLBM) developed by India to boost its second strike capabilities and thus augment its nuclear deterrence.

K-4 is a nuclear capable Intermediate-range submarine-launched ballistic missile under development by Defence Research and Development Organisation of India to arm the Arihant-class submarines.The K-4 is part of the K-family of missiles, It is a derivative of nuclear capable Agni series (medium to intercontinental range) missile which are already in service. It has reduced length compared to Agni series. weighs nearly 17 tonnes. It is powered solid rocket propellant.

                         K-4 Specifications

S.NO	TYPES	PARAMETERS
1	class	Intermediate-range SLBM
2	Place of origin	India
3	Used by Indian	Navy
4	Designer	Defence Research and Development Organisation
5	Manufacturer	Bharat Dynamics Limited
6	Mass	17 ton
7	Length	12 m
8	Diameter	1.3
9	Warhead	2,500 kg  stra tegic nuclear weapon
10	Engine	Solid-fueled
11	Operational range	3,500 km
12	Guidance system	Ring Laser Gyro Inertial navigation system[citation needed
13	Accuracy	Near zero CEP

 It can carry a nuclear as well as conventional warhead weighing up to 2 tonnes. K-4  new missile named K-4 seems to be a different project all together and is not based on Agni-3 which was supposed to be Agni-3 SL (Sub Launched) which was secretly under development. K which has been kept in honor of Dr. Kalam, Father of Indian Missiles in DRDO. The first test of the missile was also conducted secretly on 24 March 2014 and the DRDO admitted it officially only in January 2015 last year in the Aero-India show.

k- 5 missile

The K-5 is part of the K-family of missiles, K-5 missile is reportedly being developed by Defence Research and Development Organisation (DRDO) for the Indian strategic forces’ underwater platforms. It will arm the future variants of Arihant class submarines of the Indian Navy. Reportedly, DRDO is in the process of developing a submarine-launched solid fuel missile. It is a three-stage solid fuel MIRV capable missile with a length of 12m, width of 2m, a payload of 2-3 tonne warhead and maximum range of 5,000 kilometres and a payload of one tonne.

K-6 Missile

The K-6 is part of the K-family of missiles, K-6 missile is SLBM which is reportedly under development by (DRDO)'s Advanced Naval Systems Laboratory in Hyderabad. It is a three-stage solid fuel MIRV capable missile with a length of 12m, width of 2m, a payload of 2-3 tonne warhead. it will be India’s longest ranged missile system which will be capable of hitting target  6000 to 10000km or more with lighter payloads safely hiding in vast depth of oceans around the world.

The Sagarika- K-15

The Sagarika missile is a 700 km ranged Submarine Launched Ballistic Missile (SLBM). It is reportedly based on the Prithvi design. The program started in 1992 and was originally part of a program that would adapt a ramjet engine. Developed by the DRDO in 2007, it tested the Sagarika on several occasions from a submersible pontoon launcher. It was tested again in February of 2008 from another pontoon, simulating the environment of a submarine.

 Its final trial was on January 27, 2013 as it successful hit a predetermined target from an underwater battery. It typically carries warhead of around 500 kg, and uses solid fuel. India’s INS Arihant nuclear submarine is equipped with a B-O5 Submarine Launched Strategic Missile (SLBM) capable of hitting targets with nuclear warheads at a range of 650 km is fully operational. Defence Minister, Nirmala Sitharaman made a formal announcement during the annual award ceremony of the Defence Research Development Organisation in New Delhi on Monday (14-May-2018). India has already deployed the submarine-launched version of the B05 at INS Arihant. Indian scientists are currently in the process of developing the land version of the missile. It is an indigenous missile with several innovative designs and a unique mechanism.

 Sagarika- K-15 Specifications

S.NO	TYPES	PARAMETERS
1	class	Short-range SLBM
2	Place of origin	India
3	Used by Indian	Navy
4	Designer	Defence Research and Development Organisation
5	Manufacturer	Bharat Dynamics Limited
6	Mass	6 –7 ton
7	Length	10m
8	Diameter	0.74m
9	Warhead	1000kg
10	Engine	Two stage, solid-fueled rocket motors
11	Operational range	750 km with 1,000 kg payload

 Numerous critical technologies were proved in the successful trials, which paved the way for developing other long-range strategic missiles and has the potential to be launched from submarine, ship, and land.