Actress Cobie Smulders (“How I Met Your Mother,” “The Avengers”) loves the oceans. She’s expressing that love by working with Oceana to save the ocean’s hidden gems. Cobie joined Oceana on a dive in the South Water Caye Marine Reserve in Belize, an area bordered by the Mesoamerican reef, home to brilliantly colored organisms like sponges, ascidians, seaweeds and coral.