Underwater view of the observation caisson of the research raft NENUE, used by the Honolulu Laboratory for fish behavior studies. Six oil drums supply buoyancy to the 12 foot by 12 foot raft.

Image ID: fish5360, NOAA's Historic Fisheries Collection
Location: Hawaii
Credit: NOAA Central Library Historical Fisheries Collection; FWS BCF Honolulu Biological Laboratory

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