Now, you have probably heard of or watched this docufiction. However, it may be that this may be more than fiction. I hate to sound childish on the one hand, but on the other, it may be arrogant of us to think ourselves the sole intelligence in the universe, even on our own home planet. I sincerely believe in the Aquatic Ape Hypothesis, and there is plenty of evidence to support it, just look at our own bodies.
1. Hairless - Hair creates drag in water
2. Flexible Spine - A common trait in aquatic mammals
3. Vestigial Webbing Between the Fingers and Toes - A trait that may have led to proper webbing, a trait shared by amphibious creatures
4. Thick Layer of Sub-dermal Fat - A common trait in aquatic mammals
5. Breath Control - We humans can control our breathing, and the record for a human holding its breath underwater is 20 minutes, around the same amount of time a dolphin can dive
6. Instinctive Holding of Breath - Human infants instinctively hold their breath underwater, and instinctively know how to swim, and this is more than just living in the amniotic sac for 9 months, this is actual instinctive behavior
7. Sweat & Tears - Our tears and sweat are salty. Salt and water are precious commodities, and animals have ways to conserve them, but humans don't. This is a trait shared with aquatic animals, and not just mammals.
8. Prehistory & History - The land to sea transition has occurred before, especially in the near past. Polar Bears evolved from Grizzlies in the near past, within the past million years. Plus, Marine Iguanas have the ability to sneeze salt, not necessarily sweat it.
If this is so, if part of our history was, indeed, aquatic, then there is no doubt in my mind that aside from we humans on the land, there may be a parallel, sister race of merpeople. They've been encountered all over the world by all cultures and have been recorded in the voyages of Columbus and Hudson. They are out there, but they don't want to be found, at least not yet, not until they feel that they can trust us. They know they're being hunted, and they'll keep hiding until we stop hunting them. Given, if they exist, which I believe they do...