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Thank you guys - I answered D, and was very surprised to be told I was wrong. Nuclear is almost totally silent, except for some of the attachments, but any engine will have a sound profile that modern acoustics can pick up.

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I agree with Ron. And how in Heavens name (being polite) do you run a Stirling cycle engine in a submarine? What heat source?

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I chose answer D which is correct. Sorry but the answer to the question should be changed to D not C🤔😬😬

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I have been thinking about the longest number of words being the answer. It seems AI thinks the same (7 letters) but the clearly right answer is D with only 6 letters. But then is AI trying to set a trap with a double bluff?

Roy

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Well I went for answer D as I asumed it would be the most obvious in this day and age in modern submarines also, while maintaining minimal acoustic signature and avoiding the need for frequent snorkelling.
And I got it wrong!!??.

I have since Googled the question, which I wouldn't normally do. and Google says that this is the correct answer. And why. Google A.I. also says answer D is correct. So why did we get it wrong?????????
Our answers should be corrected.

This is Google's Answer,

The correct option is D. Nuclear propulsion using pressurised water reactors.
Explanation
Nuclear propulsion provides virtually unlimited submerged endurance, limited only by crew provisions, because the reactor does not require access to atmospheric oxygen for power generation.
Submarines with nuclear propulsion can operate for months without surfacing or snorkeling, which is a critical aspect of maintaining stealth by avoiding visual or radar detection at the surface.
While air-independent propulsion (AIP) systems (Option C) also enhance submerged endurance for non-nuclear submarines, they typically only extend it to a few weeks, not the practically unlimited duration of nuclear power.

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I read somewhere that Nuclear subs used the spare heat from the reactor to power auxiliary generators, which were Stirling engines. No exhaust no pollution and safe.
Roy

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How do you produce enough heat for a Stirling engine underwater? Really didn't understand why that's the answer

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Oh dear! Where does AI get the answers from? One of the Scandanavian countries experimented with Stirling engines in submarines and then gave up as they did not have enough power.

For local water very quiet subs the diesel one has proved to be an excellent alternative to Nuclear propulsion.

I think the question needs setting up again.
Roy

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The answer is wrong as it did not non nucular subs, only non nucucar subs use
air propolsion🤔
Philuk👍

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Hi, Boatshed, I also do the same and seal as many of the bow compartments as I can, but just in case there's a leak 😩, I fill them as much as possible with lightweight polystyrene.😊. Should make the boats bomb proof/unsinkable 😀,from someone who hasn't read the SOLAS manual 😕😃😣.

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