¡Socorro!

On a small reef in the vast ocean, a crab searches for a place to rest its claws. Then it sees a squid approaching. Startled, it looks for somewhere to hide and ventures into a dark cave, as black as the deep sea. The crab thinks it has found the perfect hiding place, but it soon discovers it's not the only one who's had that idea. What will happen when the cave is no longer empty? Or, worse yet, dark?