Samples of marine sedments, collected using a dredger 90 meters deep, close to the Amazon Reef. Scientists want to understand the influence of the Amazon river in the bottom of the ocean in this region, where no study has happened until now. The ship Esperanza is in Brazil for a scientific expedition to the Amazon Reef. Researchers and the Greenpeace team seek for more information on this unique biome. International oil companies want to drill for oil soon within a few kilometers of the Amazon Reef. However, experts warn that an oil spill in the area would irreversibly threaten the well-being of the ecosystem and people living in the coast.