Milwaukee Deep, also known as The Milwaukee Depth, (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.  ) is the deepest part of the
This ocean floor feature is named for the USS Milwaukee (CL-5), a U.S. Navy Omaha class cruiser, which discovered the Milwaukee Deep on February 14, 1939 with a reading of 28,680 feet (8,740 m).  
On August 19, 1952, the U.S. Fish and Wildlife vessel Theodore N. Gill obtained a reading of 28,560 feet (8,710 m) 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 22,950 feet (7,000 m) at ( ). 
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- "Milwaukee Depth". Encyclopædia Britannica. 2009. Encyclopædia Britannica Online. 12 October 2009 < http://www.britannica.com/EBchecked/topic/383165/Milwaukee-Depth>.
- Bulent Kastarlak (1958). "Low Cost Housing Development with Aided Self-Help Method in Bayamon, Commonwealth of Puerto Rico" (PDF). dspace.mit.edu. Archived from the original (PDF) on 2014-08-26. Retrieved 2014-08-25.
- Vaughn et. al (1940). "Chapter II: The Earth and its Ocean Basins" (PDF). earthguide.ucsd.edu. Retrieved 2014-08-25.
- Silverstone, Paul (2008). The Navy of World War II: 1922-1947.
- 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. < https://www.jstor.org/stable/99222>
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