Re: [PSUBS-MAILIST] The last dance, The Russians, Diesel vs. Nuclear subs and...

[MerlinSub@t-online.de]

A good build diesel electric makes underwater less noise than the sea noise background.. 
And if you can hear the torpedohatches of the sub it is in general to late.. 

But anyway it is made from metal and that can be detected. 

I now there is a technology available called gravimeter. They can meassure 
with this very expensive liquid helium cooled instruments the gravity field of the earth and detect local differenes.
Anyway if it is a silver mine some miles away, leaves in the garden in front off the institut some yards away 
or submarines under the northpole..  

vbr Carsten "In peace time in submarines - in wartimes at home in the garden"



<ShellyDalg@aol.com> schrieb:
> " Being quieter or even comeletely silent when sumberged."
>  
> It's not the sound of a diesel motor running that gets detected when subs  
> are submerged. Even small noise levels are detected. A military sub can hear 
>  torpedo doors opening, props turning, cavitation if there is any, and 
> possibly  even loud noises generated inside a sub. Water transmits sound very 
> good so if  you were banging around inside a steel hull the right listening 
> equipment would  pick it up. 
> Frank D.
> 




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