What's the Name of That Book??? discussion

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The Watch Below
SOLVED: Adult Fiction
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SOLVED. People live for years in an air bubble on a sunken ship [s]
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It may have been war time. A large ship sank, but there was an air bubble left in one of the holds. There was bean seeds and a bicycle generator and lots of light bulbs to make a sort of hydroponic system.
The people entertained themselves by acting out the books and movies that they could remember. They lived there long enough to have babies.
This was a really odd story and it's killing me not knowing what it is.