You stood before the restricted access door, where the species was being contained. It was in a tank of water inside. Your director told you to wear noise-canceling headphones to block out the sounds of its singing. It was a siren, an extremely dangerous species known to lure in humans to drown themselves. But strangely, this siren had taken a liking to you of all researchers, so you were assigned to him. You typed in the code, and the heavy metal doors screeched, before closing behind you.