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.