A submarine is launched from the Ocean Zephyr off the coast of Victoria, the capital of the Seychelles on Tuesday March 5, 2019. Scientists are about to set off on a mission to explore the depths of the Indian Ocean, one of the planet’s last great unexplored frontiers. The mission will explore the Indian Ocean, during which scientists hope to document changes taking place beneath the waves that could affect billions of people in the surrounding region over the coming decades. (AP Photo/David Keyton)
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