The colossal crab was obviously alive and had clearly been for a very long time, floating on the sea. Its shell and its claws—the twin reefs—were covered with sand and plants and trees, though the deep red color of the crab’s shell dominated along the edge of it.
The crab protect other creatures if they help him. For example: it offers the squid protection from the eel if the squid brings it food. However, if a creature moves too far away from its claws, the crab cannot protect it.