Everything you need to understand or teach Reliquary by Douglas Preston.
Snow is on his first dive with a New York Police Scuba squad and is going into a waterway called the Cloaca Maxima. It's filled with sludge and debris with almost a zero visibility. He and the other divers are searching for a large brick of heroine that was part of a police shooting. While he doesn't locate the drugs, he finds two headless skeletal remains. The police officer in charge...
Reliquary Lesson Plans contain 121 pages of teaching material, including: