Milwaukee Deep at (), virtually identical with the "Milwaukee"s reading. The existence of deep water to the Atlantic Ocean side of the Caribbean has been known for more than a century. One of the area's earliest soundings was obtained June 12, 1852 by Lt. S. P. Lee, U.S. Navy brig "Dolphin", with a reading of at (). Milwaukee Deep Milwaukee Deep, also known as The Milwaukee Depth, () is the deepest part of the Atlantic Ocean and is part of the Puerto Rico Trench. It has a maximum depth of at least . It is just north of the coast of Puerto
Nereus (underwater vehicle) designing the vehicle, the design team relied on previous experience in developing autonomous underwater vehicles (AUVs) and tethered robots to build a hybrid vehicle that could both fly like an aircraft to explore large areas of the ocean floor, but would be easily converted into a remotely operated vehicle (ROV) able to hover over the small areas to conduct experiments or collect samples of rocks and sea life. The Challenger Deep is located in the Western Pacific Ocean near the island of Guam in the Mariana Trench, the deepest known part of an ocean on earth, and the deepest known