Slow motion MS of thick-billed murre swimming, turning tail up and diving, disappearing underwater. MCU of large group of thick-billed murres swimming (individual murres in LS MLS) swimming, sunlight sparkling off water, ice/snow formations in background. Brief MS of small group of murres swimming along, all turn tail up and dive suddenly in unison, disappearing underwater. MLS of five thick-billed murres swimming in water revealed by crack in ice/snow (look like their own private pond in vast frozen expanse). MS of group of thick-billed murres swimming, sunlight sparkling off water, large chunks of ice/snow formation in background. (LETTERBOXED MATERIAL) (40892)