Nightmare Fuel / Mermaids: The Body Found

• The Navy sonar testing, a classic example of Nothing Is Scarier.
• The Jump Scare, while predictable, is pretty effective.
• The Megalodon attack, where one hunts and kills a whale while its companion decides to make a meal out of the nearby mermaid pod.
• Whether they are benevolent or not, the designs of the mermaids goes into Unintentional Uncanny Valley territory.