Diving with a whale shark was a dream I had since childhood when I watched a documentary by Jacques Cousteau, where he dived with these giant, harmless sharks. I kept this image registered in my memory and I knew ... Diving with a whale shark was a dream I had since childhood when I watched a documentary by Jacques Cousteau, where he dived with these giant, harmless sharks. I kept this image registered in my memory and I knew that one day I would dive with these giant and gentle sharks. I researched and discovered that during a period of the year between the end of May and the beginning of September thousands of whale sharks gather in the Yucatan peninsula, the encounter between the Caribbean Sea and the Gulf of Mexico, phenomenon of resurgence. The oceanographer phenomenon of resurgence or outcropping is rare and occurs at few points in the oceans. It consists of the rise of deep waters, which often carry with them nutrients to shallower regions, similar to a convection stream, yet having the influence of pressure on it. The outcrop occurs thanks to the union of two factors: the wind and the earth rotation movement. The first one moves the surface layer waters, which are warmer, toward the ocean and this is caused by the Earth's rotation. This, in turn, due to differences in hydrostatic pressure, causes the rise of deep water, which are cooler. At this elevation, some nutrients from the seabed are also carried near the waters, which, in the absence of light, are inert. In the presence of this, however, they are used by microscopic algae, which carry out photosynthesis, increasing, in this way, the number of producers (first level of the food chain, plankton). Consequently, the other levels, consisting essentially of fish, will have an abundance of food, and will also grow, diversity of species. Carrying nutrients for both small fish, and for giants like sting rays and whale sharks. (as it happens in Arraial do Cabo, in Rio de Janeiro)