Explorer Victor Vescovo and his team embark on their epic mission and search for the deepest point of the Atlantic Ocean, taking their prototype submarine to explore a vast trench five miles deep near the island of Puerto Rico.

Explorer Victor Vescovo and his team head into the most challenging ocean on Earth, the Southern Ocean, where they dodge menacing icebergs and search for the ocean's deepest point in the vast underwater canyon of the South Sandwich Trench.

Explorer Victor Vescovo and his team head to the warmest ocean on Earth, the Indian Ocean, home to a deep trench that's a trigger zone for deadly tsunamis, and where the collapse of a towering cliff face could generate a catastrophic tidal wave.

Explorer Victor Vescovo and his team take on the Everest of ocean exploration, the Mariana Trench in the Pacific Ocean, and at nearly 36,000 feet, it's the deepest place on Earth where remarkable discoveries await.

Explorer Victor Vescovo and his team take on the final leg of their historic mission and head into the frigid Arctic Ocean, and with falling temperatures and an approaching storm, it's a race against time to identify its deepest point.