I read this book +20 years ago. What I remember is the following:

Someone built a device that in case the water of the ocean rise it would be transported to a bubble in space, and in case the water drops the water from the bubble would flow back to the oceans.

Inside the bubble are also people, lost submarine and a intelligent "slime" that control them and also sharks and other fish. The slime send woman back to earth. The rest I don't remember.

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    Dang it.....i think i've read this .... do the people use metal 'cages' around their heads to capture bubbles of air to breathe? sort of like diving helmets without the helmet part.....? – user22225 Jul 7 '17 at 10:23
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    @user22225 yes, they do. – Organic Marble Jul 7 '17 at 11:35
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    @Otis I did the duping the other way round, because the answer to this one is so much better. Thanks for finding the older question! – Rand al'Thor Jul 14 '17 at 18:51
  • @Otis please don't dupe by age but by quality of content. – Edlothiad Jul 14 '17 at 18:52

This is Bob Shaw's Medusa's Children (1977).

An ancient sea level regulating system teleports excess seawater to a place in space. It forms a huge bubble where sealife and people who got trapped in the transfer form an ecosystem.

The protagonist gets involved by discovering a creature that came through the transfer machinery the other way, to Earth. He winds up in the bubble.

You can read a review with more info here.

I got this book from the Science Fiction Book Club back in the day. It had an unfortunate cover.

enter image description here

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    Unfortunate cover? He looks like the banjo kid from Deliverance! – DannyMcG Jul 7 '17 at 18:25

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