If you mean unknown environments that might contain new and undiscovered things (such as animals and plants), yes. We’ve only just begun our exploration of the deep ocean and already lots of surprising discoveries have been made including independent ecosystems where all the plants and animals get their energy from geothermal vents (so they don’t need sunlight at all). I am one of those people who tends to believe that there will be something interesting out there in the unknown, and I think it’s more likely that there’s something new we’ve never encountered than that it’s just sand and mud. But that probably says more about me than what’s on the bottom of the sea.
Not worlds that were ever inhabited by humans (except ancient cities that have sunk).
But there is still a whole natural world to explore down there that we are only beginning to find out about. It wasn’t so long ago that life was discovered near volcanic vents under the sea – where you have microorganisms growing that can survive in temperatures of 95°C. Indeed we use some of the enzymes from these bugs in molecular biology experiments. There is an organism with a lovely name – Pyrococcus furiousus (PFu) – from which one can extract a polymerase enzyme. This is used in the polymerase chain reaction which is a neat way of making millions of copies of any piece of DNA. We do this almost every week in the lab.
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