Falls into the red murky pool/inadvertently goes skinny dipping

(chapter originally by Zendle at writing.com)

Mackenzie let out a scream as she slipped and barreled headfirst off the diving board, a few terrifying seconds later the naked redhead splashed into the murky pool. After a few more seconds of thrashing around Mackenzie's head thrust upwards, coughing and spluttering from accidentally swallowing some of the 'water.'

Indeed, what got into her mouth was not something she wanted in it again, the taste was cold and metallic, and the texture thicker than normal water. Indeed, with her head above the waves, her hair felt greasy and heavy, and up-close Mackenzie could see the vile liquid was thick, smelly and felt all around unclean. Looking around, Mackenzie wanted a way out of the pool, but she couldn't spot a ladder anywhere in the darkroom. Before she could do anything else however...