porky_kicker
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These are for the indian nuclear submarinesWhats this ??
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Nuclear submarines spend most of their time underwater.
And lot of garbage is generated by the crew ie leftovers from meals etc which need to be disposed off.
For that a garbage disposal chute is used.
It allows the ejection of garbage even when the submarine is underwater.
It is a risky process , however thoroughly tested and vetted.
Garbage is collected in special bags and tied to bricks / weights to give the necessary negative bouyency so that it sinks to the bottom . It is then put into the chute , it has interlocking doors , after the inner watertight doors r locked , high pressure air is released to eject the garbage bag out of the submarine and then the outer hull doors are locked.
Principle is same as that of a torpedo being launched from a torpedo tube.
(A submarine general area of operations / patrol route even during peacetime can be determined by tracking the wastes it's generates , so this technique is employed to keep its location from not being discovered as the garbage gets dropped to the bottom of the sea )
Secondary purpose of this is to launch distress or signal cartridges
Another purpose if required under extreme special circumstance is to deliver coded messages/items of interest etc etc tied to a water proof container with a colour marker unit to the surface for retrieval by friendly helicopters or ships. This is done if the submarine cannot communicate or cannot surface or is under EMCON or wants not to for what ever reasons .
The container ascend rate is predetermined so as to allow the submarine to leave the area before the container floats to the surface and releases it marker a pre-determined time limited colour/dye which spreads on the surface for easy visual contact for the sub surface or air borne retrieval party
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