I'm betting there's no really exciting giant
animal 'hiding' in the ocean. A lot of the
species we haven't found yet are microbes and
other small plants and animals. There will be
exciting things to learn from these, especially
ones that live in hostile environments that are
too hot, too acidic, or have too much oil, and so
forth. Another environment we're studying is the
very cold water in lakes under the ice in
I'll predict that the largest new animal found
in the oceans is not longer than 2 ft. But maybe
there will be longer new animals found if you
count things like a new kind of shark that's
related to sharks we already know about.
The chance of finding a megalodon or some
huge prehistoric creature hiding in the waters of
the oceans is very small (but not zero!). There
are parts of the ocean that remain poorly
explored, especially parts of the deep sea, but
what you say about not having discovered "half
of the ocean" is not true. We have explored
the entire ocean in very cursory detail (e.g. we
have maps of the seafloor), and very little of it
in great detail. Large animals like the megalodon
are much easier to find than smaller animals. It
is much more likely that smaller "prehistoric"
creatures do still dwell in our oceans though, and
that we have not found them yet.
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