Pahoehoe Island - Under the Sea
"Yup, I can hear you," Ms. Nettle replied over the comms. The voice was ever so slightly distorted and there was a faint white noise sound, but was otherwise pretty clear and understandable. "I've got Alpha on another channel, so if I ever take a moment to reply, it's probably related to that. If the comms ever go 100% silent, that means we are disconnected." Apparently the faint white noise was a feature, not a bug.
Ms. Nettle let Sea Witch move around in the water for a while and get the lay of the land. There wasn't a lot of variation in the sea life in this particular area. Mostly just rocks, sea grass, and the occasional fish or urchin. The water was pretty deep, but not so deep that no light reached the ocean floor. The only notable features were the occasional chasms along the ground that would break up the otherwise monotonous sea floor. The cracks weren't huge, but Klythie could likely squeeze into some of them if she desired. They did all seem to head in the general direction of the volcano.
There was one other detail that seemed to catch the detective's eye as well. Something concerning the local wildlife. Just as she had figured out what she was looking at, Ms. Nettle's voice returned. "Checking in. What is your progress? The ship's sonar can only tell me so much."
Klythie, you have spotted evidence of some type of noteworthy sea creature that lives in the area. What is it? It can be as mundane or fantastical as you desire.