So this video is almost two years old, but every year as the waters cool on the southern shores, hundreds of thousands of Giant Spider crabs find their way up on the sandy shallows Rye and Blairgworie in Port Phillip Bay, Melbourne Australia. This happens between May - July ever year and the result is a moving sea of orange crabs that blanket the shallows.As the name suggests these crabs are massive. Their legs are over 70cm long with a body measuring nearly 17cm wide. They move in organised chaos on 8 long legs. Their weapons, swollen claws. Their mission, seek shelter in the safety of the sandy shallows, moult and in some cases mate. I would stay away from these waters!