Most of our planet is underwater, which is a fact it can be easy to forget. And the amount we really know about what goes on below the surface is actually not a whole lot. The watery world around us is still a huge mystery and there are plenty of strange things being discovered as technology improves that are just blowing our minds. From the ancient submerged city to the water that turns into milk, here’s 20 Bizarre Things Found Underwater Nobody Can Explain.