Cruise LMG05-02 to the former Larsen-B Ice Shelf (LIS-B) resulted in the discovery of a cold-seep community located ~50 km from the edge of the historic extent of the ice shelf.  Images revealed gross morphological features at the site strongly resembling those of other chemoautotrophic methane seeps.  However, this seep is unique from others described in that (1) it is the first active polar cold-seep yet discovered, and (2) it formed in a sub-ice shelf environment with limited inputs of photosynthetic carbon.  More recently, cruise ANT-XXIII/9 imaged the cold-seep ~2 years after its discovery revealing a collapse of the cold-seep megafauna.  We suggest that a combination of the aphotic sub-ice shelf environment and isolation of the cold-seep basin resulted in the manifestation of the chemosynthetic community.  The disappearance of the LIS-B, associated increased primary productivity and transport of glacigenic sediments may have resulted in the collapse of the chemosynthetic community.