The Poisoned Lake.

At the bottom of the deepest ocean, there is a lake. Where dense, ultra-salty seawater sinks to the ocean floor, it forms a toxic pool of unfathomable depth, deadly to all but the hardiest of undersea life. Somehow, strange muscles, hundreds of years old, thrive on the banks of this mysterious lake. But most sea creatures brave or desperate enough to cross it meet their end in its murky depths. Eels venturing from the safety of their caves to hunt on the lake tie themselves in knots as the deadly toxins claim them. Shimmering silver fish twist and turn gently on the current, their embalmed bodies doomed to float upon the surface, washing up on the banks of the lake and adorning its shores for years to come.

With its surface of soft, pale mist, the lake looks peaceful and ethereal, inviting, even. Its calm appearance belies its deadly secret.