sentences:  The current knowledge of the functioning of the ecologically and economically important hard-bottom communities in the shallow water coastal zones is both limited and particularly difficult to study due to poor accessibility for surface operated instrumentation as a result of topographic and structural complexity which inhibit remote sampling of organisms in the benthic boundary layer.In situ assessments by scientific divers remain the most flexible tool for exploring this habitat and allow precise and optimised location of instruments.The capacity to dive under polar ice provides an opportunity to advance science in a restricted environment
  at relatively low cost.