Hydromedusa

The hydromedusa only appears once you've completed Cam Jameson's task. It is a dangerous jellyfish that will sting your submarine, causing it to lose its power, and you will sink to the bottom of the ocean.

Storyline
Once you take pictures of all five animals, a short cutscene will appear, in which a hydromedusa quickly swims past you off to the right. Cam Jameson will become excited and demand you chase after it for a picture.

The hydromedusa will lead you to open waters. Once you're snapping a photo, a crowd of hydromedusas will swarm you and sting your submarine, causing you to sink to the bottom of the ocean.