King crabs and other crushing predators are thought to have been absent from cold Antarctic shelf waters for millions of years. Scientists speculate that the long absence of crushing predators has allowed the evolution of a unique Antarctic seafloor fauna with little resistance to predatory crabs. A recent study by researchers from the University of Hawaii at Mānoa, Duke University, Ghent University, Lamont-Doherty Earth Observatory, and Hamilton College, indicates that one species of king crab has moved 120 km across the continental shelf in West Antarctica and established a large, reproductive population in the Palmer Deep along the west Antarctic Peninsula.

Go here to see the original: 
Crab Invasion from Antarctica?

King crabs and other crushing predators are thought to have been absent from cold Antarctic shelf waters for millions of years. Scientists speculate that the long absence of crushing predators has allowed the evolution of a unique Antarctic seafloor fauna with little resistance to predatory crabs. A recent study by researchers from the University of Hawaii at Mānoa, Duke University, Ghent University, Lamont-Doherty Earth Observatory, and Hamilton College, indicates that one species of king crab has moved 120 km across the continental shelf in West Antarctica and established a large, reproductive population in the Palmer Deep along the west Antarctic Peninsula.

Continued here: 
Crab Invasion from Antarctica?