Editing Milwaukee Deep (section)

== History ==
[[File:USS Milwaukee (CL-5) underway, circa the early 1930s (NH 97979).jpg|thumb|right|300px|Discoverer ship [[USS Milwaukee (CL-5)|USS ''Milwaukee'' (CL-5)]]]]
The ocean floor feature is named for the [[USS Milwaukee (CL-5)|USS ''Milwaukee'' (CL-5)]], a [[United States Navy|U.S. Navy]] [[Omaha class cruiser]], which discovered the Milwaukee Deep on February 14, 1939 with a reading of {{convert|28680|ft|m fathom}}.<ref name="ucsd2">{{cite web|url=http://earthguide.ucsd.edu/earthguide/data/pdf/chapter2.pdf|title=Chapter II: The Earth and its Ocean Basins|author=Vaughn |display-authors=etal |publisher=earthguide.ucsd.edu|date=1940|accessdate=2014-08-25}}</ref><ref name="WWII">{{cite book |last=Silverstone |first=Paul| title=The Navy of World War II: 1922-1947|year=2008}}</ref> On August 19, 1952, the [[United States Fish and Wildlife Service|U.S. Fish and Wildlife]] vessel ''Theodore N. Gill'' obtained a reading of {{convert|28560|ft|m fathom}} at ({{coord|19|36|N|68|19|W}}), virtually identical with the ''Milwaukee''{{'}}s reading. By then, the existence of deep water to the Atlantic Ocean side of the [[Caribbean]] had 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]] [[USS Dolphin (1836)|''Dolphin'']], with a reading of {{convert|22950|ft|m fathom}} at ({{coord|26|32|N|60|06|W}}).<ref name="Lyman-1954" />

=== Crewed descents ===
[[File:Limiting Factor to be prepared for a dive into the Atlantic Ocean.jpg|thumb|Deep Submersible Support Vessel ''[[USNS Indomitable (T-AGOS-7)|DSSV Pressure Drop]]'' and ''DSV Limiting Factor'' at its stern]]

In 1964, the French submersible ''[[Archimède]]'' explored the Puerto Rico Trench to a depth of approximately {{convert|8300|m|ft fathom|abbr=on}} but did not reach its deepest point.<ref name=":2"/>

On 21 December 2018 Victor Vescovo  made the first crewed descent to the deepest point of the trench in the Deep-Submergence Vehicle ''[[DSV Limiting Factor]]'' (a Triton 36000/2 model submersible) and measured a depth of {{Convert|8376|m|ft fathom|abbr=on}} by direct [[CTD (instrument)|CTD]] pressure measurements.<ref name=":2"/> This made the ''Limiting Factor'' the deepest diving operational submersible at the time.<ref name=":2" /><ref name="202100505RMS">{{cite journal|title=High-resolution multibeam sonar bathymetry of the deepest place in each ocean |year=2022 |publisher=Royal Meteorological Society |doi=10.1002/gdj3.122 |last1=Bongiovanni |first1=Cassandra |last2=Stewart |first2=Heather A. |last3=Jamieson |first3=Alan J. |journal=Geoscience Data Journal |volume=9 |issue=1 |pages=108–123 |s2cid=235548940 |doi-access=free |bibcode=2022GSDJ....9..108B }}</ref>