In the newest update of "20 000 cogs under the sea" oxygen can not only be mined from the underwater volcanoes. You'll be able to build whale attractors, where whales will bring oxygen from the surface.Later on this oxygen will be transported downto your underwater base to let you produce money.
Whale attractors become available once your upgraded base reaches halfway to the sea surface and their initial price is 200M (subject to further ballansing).
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