Following in the wake of the first great Triton beast to emerge from the oceans depths, these lesser creatures would still qualify as sea monsters if you found one washed up on the beach. steel shell crabs are so named because of their incredibly dense exoskeletons. In the first skirmishes between these mega crustaceans and G.U.A.R.D. forces, the crabs shells were virtually immune to all but the largest ordnance. Luckily, it was soon apparent that, like their larger counterparts, the steel shell crabs were more interested in fighting Earths invaders than anything native to the planet.