It's very important to know if your sub is nuclear (BTW, I pronounce it correctly, new-clear), because that means the difference between staying under for a few hours and staying under for a month.
This discussion reminds me of the Titanic "Mystery Ship". Times change, but what is really different?

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I want to go back to the moon.
I don't care which rocket you use, whichever one you pick, I'll like it, I swear.
"If you think the LHC will create black holes, you might as well believe Hobbits are at the bottom of your garden."- Dr. Mike Inglis
Rovers forever! - ToSeek