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Milwaukee Deep, also known as The Milwaukee Depth, (19°35'N, 66°30'W) is the deepest part of the Atlantic Ocean and is part of the Puerto Rico Trench. It has a maximum depth of at least 27,493 feet (8,380 m). It is just 76.0 miles (122.3 km) north of the coast of Puerto Rico at Punto Palmas Altas in Manatí.
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 22,950 feet (7,000 m) at (26°32'N, 60°06'W).
- "Milwaukee Depth". Encyclopædia Britannica. 2009. Encyclopædia Britannica Online. 12 October 2009 <http://www.britannica.com/EBchecked/topic/383165/Milwaukee-Depth>.
- The Deepest Sounding in the North Atlantic, J. Lyman, Proceedings of the Royal Society of London. Series A, Mathematical and Physical Sciences, Vol. 222, No. 1150, A Discussion on the Floor of the Atlantic Ocean (March 18, 1954), pp. 334–336. Published by: The Royal Society. <http://www.jstor.org/stable/99222>
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