You wake up after blacking out, but then found yourself strapped to a table, while your clothes were off, and you noticed that there was a woman in front of you wearing both a diving suit, and a lab coat. You then turn around to see that she was blonde, had enormous breasts, and had glasses on with a surgical mask.
"Oh, you must have woken up before I had the chance to turn around, and finish," she explains. "Now if you're wondering why I've brought you here? Well soon human civilization will fall to extinction, and I shall use a test subject to create a new lifeform. Of course to do that, I'll have to combine you with a sea creature. Sharks were too dangerous to get near, and whales were too big. I of course have only 2 other creatures I could have you fuse with, or turn you into, so just relax, while I do it.