not far from sharon how casias lake should net a smaller but perhaps even more peculiar body of water and another focus for the bio physicists study. is as low as half that of ocean water that can reach double average oceanic salinity for that reason it's home to a very rare very simple spectrum of biological diversity a short in food chain with tiny crustaceans at the top it's also a merrill mcpeak lake meaning that while most lakes frequently undergo physical mixing of water layers should stay more or less suspended in place leaving oxygen depleted depp's like we witnessed below the surface of. the make up of the each of the lakes fine layers the crescent team developed their own patented hydraulic sampler with the ability to collect specimens at intervals of just five centimeters . this strange contraption helped us to discover the thick. it is unique in terms of the predominance and sheer numbers of purple sulfur bacteria. such a massive population of these types of bacteria. can be attributed to specific conditions to help the species thrive. physics institutes base camp after a