# Submarines China Russia and the US

**URL:** <https://boards.straightdope.com/t/submarines-china-russia-and-the-us/293586>\
**Category:** Factual Questions\
**Created:** [March 8, 2005, 11:15pm UTC](https://boards.straightdope.com/t/submarines-china-russia-and-the-us/293586 "2005-03-08T23:15:33Z")\
**Posts on this page:** 1\
**Page:** 2

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**Author:** ![Coil](https://avatars.discourse-cdn.com/v4/letter/c/bb73d2/32.png) [@Coil](https://boards.straightdope.com/u/Coil)\
**Post date:** [March 11, 2005, 3:34pm UTC](https://boards.straightdope.com/t/submarines-china-russia-and-the-us/293586/21 "2005-03-11T15:34:02Z")

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> [@ralph124c](#):
>
> About those “closed-cycle” diesel-electric subs (which the Swedes and Australians are building): how long can they stay underwater? Are they just coastal patrol boats, or can they undertake “blue water”;ong-duration missions?

[Kockums](http://www.kockums.se/) makes submarines with Stirling engines. Their site has some descriptions on how stirling engines work and details on the subs.

The submerged endurance for the [Gotland Submarine](http://www.kockums.se/Submarines/gotland.html) is weeks according to the specs at the bottom of the page.

Apparently it is also pretty darn quiet. The US Navy wants to rent one for a year to practice against it. [cite (in Swedish though)](http://www.dn.se/DNet/jsp/polopoly.jsp?d=145&a=324422)

Kockums also makes the [Visby class ships](http://www.kockums.se/SurfaceVessels/visby.html) that are stealthy. Kinda neat ships.

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