Ghost Pirates of the Sea-erra Madre

You swim forward and see an entire series of caves emerge from the murky depths.

As you gaze at the cave entrances small fish swim by you and you see crabs and other crustaceans making their way along the sandy ocean floor.

Most of the caves seem quite shallow, but two of them are deep enough that your light cannot reach the back. The larger of the two dark caves has an entrance wide enough for you to enter with the Seeker, while the smaller would be a tight fit for you, but you're pretty sure you can make it inside.