Launch capsule
Encyclopedia
A launch capsule is used to propel a submarine-launched missile
Submarine-launched missile
A submarine-launched missile is a guided missile fired from a submarine. Some SMs are placed in launch capsules to be fired through the submarine's torpedo tubes. These missiles are initially solid-propellant motor-driven, and once clear of the water ignite their booster motor...

 to the ocean
Ocean
An ocean is a major body of saline water, and a principal component of the hydrosphere. Approximately 71% of the Earth's surface is covered by ocean, a continuous body of water that is customarily divided into several principal oceans and smaller seas.More than half of this area is over 3,000...

surface. Upon reaching the surface, the capsule is jettisoned, and the missile continues its journey propelled by the booster motor.
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