Film summary Film no. 1 is called The Open Ocean. In this film, the author takes a look at the Pacific. The Mariana Trench (7 miles deep) is said to be the deepest place on earth. The highest mountains in the world are located there. In the shallower waters there is a lot of life. Photosynthetic organisms are the basis of all life in the sea. Additionally, some animals such as sea anemones and sea cucumbers allow currents to carry particles towards them, and some creatures pulse to supply oxygen to their bodies, an example would be coral polyps. As the film shows, the ocean has acquired a population of immense diversity. The largest of all fish is the whale shark (50 feet long). Sharks evolved 400 million years ago. But the fish that dominates the sea today is the bony fish. They have paired bones, swim bladder and fins. They can swim up to 70 miles per hour. Furthermore, 10 million years ago mammals invaded the sea and became more streamlined. Dolphins and killer whales descended from land-based carnivores. Walruses and seals are the sea's most recent invaders. They have not yet lost their feet and go ashore to rest. There are more different types of organisms in the sea than on land, and there are many different environments. Large areas of the ocean floor have nothing but sand. The film is about cuttlefish, which bury themselves in the sand to hide from their prey. Floating plankton need light to survive, so they are the only ones found near the surface. In conclusion, the film highlights that the ocean waters are very rich. Warm water from the Gulf Stream meets a cold current from the Arctic, mixing nutrients in large quantities. Film no. 2 is titled The Margins of the Land. The film shows the highest tides in the world, namely the "Bay of Fundy" (eastern Canada), and mangroves, trees that grow in the tropics between land and sea. Mangrove forests are home to some unique animals, for example the proboscis monkey, which eats only mangrove leaves. Furthermore, there are 40 different species of mangrove trees. They have very shallow roots that grow close to the surface. Mudskippers are fish that spend a lot of time out of water. It keeps your skin moist to absorb oxygen through it. Large crabs have a pool of water above their shell for oxygen.