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If you like to breathe, be concerned about the ocean, preaches the new IMAX feature The Living Sea—aquatic flora churn out most of the oxygen in Earth’s atmosphere. Besides, the ocean is God’s own underwater theme park. A mysterious, diaphanous creature half the size of a football field is eyed by a deep-sea probe. Divers navigate their way through a swarm of Palauan jellyfish 1 million strong. A Coast Guard rescue boat endures a roller-coaster ride through 15-foot waves off the appropriately named Cape Disappointment in Oregon. Meryl Streep narrates this 40-minute IMAX film, and old Sting tunes provide background music. At 6:15 each day at the National Air & Space Museum’s Langley Theater, 6th & Independence Ave. SW. $2.75-3.75. (202) 357-2700. (Greg Kitsock)