Read the text below. Choose from the one which best fits each space. 

A decade ago, Fabrice Schnuller was an engineer . In 2007, he went on a sailing trip to the island of Mauritius. One day, when his boat approached the coast, giant towers of steam began . Curious as to the source of this strange ocean phenomenon, Schnuller grabbed his snorkelling equipment and a camera, and jumped in. Diving down beneath the ship, Schnuller felt his ears were bombarded by what sounded like underwater explosions, the deeper he went. At first he feared the boat had suffered a mechanical failure. But as he circled around, he began to sense that he was not alone. Glancing downwards, Schnuller froze. Out of the darkness, a series of giant dark monolithic shapes were heading directly towards him. It was a group of whales speeding towards the surface. As they approached, the sounds grew louder and louder until they penetrated his flesh like an X-ray. Schnuller felt the warm vibrations from every angle. The whales surrounded him, staring with large, unblinking eyes. At more than 60 feet in length and weighing approximately 125,000 pounds, they made him feel small. But rather than in one gulp, the whales appeared to be deeply intrigued. After scanning him, the rhythm structure of their sounds began to change. Schnuller later realised that these were the patterns that we believe whales use to communicate and send information. The whales appeared to be speaking to him. They stayed for two hours, circling, staring and showering him with bursts of sound, before into the deep.
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