Although most of us would gag at the thought of drinking water that’s been left sitting out for days on end unless we were desperate, the same can’t be said for the scientists involved in an incredible study. In 2013, scientists from the University of Toronto discovered the water over 1.5 miles beneath Earth’s surface, left isolated from the outside world for millennia in Timmins, Ontario, Canada. Most people would probably agree that this isn't a liquid for drinking, and is between 1.5 billion and 2.6 billion years old. But apparently professor Barbara Sherwood Lollar isn't most people. As lead researcher, Lollar tried the water and herself and judging by her reaction, it tasted just as nasty as it sounds.