In 1925, the keel was laid for the Royal Netherlands Navy destroyer Hr.Ms. Kortenaer at Burgerhoutdockyard in Rotterdam. Three years later, the 98 m long ship entered service in the East Indies. In early February, 1942, Kortenaer was grouped with an attack squadron led by Rear-Admiral Karel Doorman, which was to thwart the invading Japanese forces at Bali. However, the ship stranded on a sandbar and was unable to participate in the (failed) attempt.

Battle of the Java Sea

On February 27 , 1942 Kortenaer saw its first combat action during the Battle of the Java Sea, which would seal the fate of the Dutch East Indies. While sailing off the Javanese north coast, the American-British-Dutch-Australian Command fleet under Dutch Rear-Admiral Karel Doorman, was surprised by two Japanese heavy cruisers, Nachi and Haguro.

Soon, the Allied forces found themselves under heavy fire from the high caliber Japanese guns. Doorman, however, managed to get his ships in range to return fire. Even though both sides exhibited poor gunnery and torpedo skills during this first phase of the battle, Hr.Ms. Kortenaer was hit by a Japanese torpedo salvo. The Dutch ship sank with the loss of 60 crew members. 113 survivors were rescued by the HMS Encounter. Later that day the Allied ships Exeter, De Ruyter, Java and Jupiter were also sunk by the Japanese. The battle factually eradicated Dutch presence in South-East Asian waters and marked the end to the Dutch colonial age.

Discovery

The wreck of the Java was discovered at a depth of 52 m off Bawean island, using side-scan sonar and diving inspections during an expedition led by Kevin Denlay in late 2004. The stern section of Kortenaer was found lying on its starboard side in good condition. One set of triple torpedo tubes were also visible trapped in large amounts of fishing nets that was draped over the wreckage. This provided the evidence for the wreck's identification, as no other warship lost in the area had triple torpedo tubes. No pictures of the wreck are available, due to the extremely poor visibility under water.

Salvage

In 2016 it was discovered that the wrecks of De Ruyter and Java, and much of Kortenaer had disappeared from the seabed, although their imprints on the ocean floor remained. During a meeting on November 23, 2016, President Widodo of Indonesia and Prime Minister Rutte of the Netherlands agreed that the countries would work together to determine what had happened and to preserve their maritime heritage in the future. A three-tracked approach was agreed upon by both governments:

Verification of the disappearance;
Appreciation of what had happened; and
Future cooperation to manage remaining maritime cultural heritage.
For more information on this joint Dutch-Indonesian investigation see:
Java Sea dossier

RCE

• Report of the Dutch Shipwrecks in the Java Sea.
• M.R. Manders/R.W. de Hoop/S. Adhityatama/W.A. Barten/B. Budi Utomo/O. Dwiyana/A. Kusno/J. Rechar & Z. Tahir (2017).
  Joint Verification of the location and condition of Hr.Ms. De Ruyter, Java and Kortenaer.
• RCE (2018).
  Public Summary Report of the Joint Expert Meeting on the Appreciation (track II) of the Dutch Shipwrecks in the Java Sea.
• M.R. Manders & R.W. de Hoop (2018).
  Battle of the Java Sea: Past and Present Conflicts.
• M.R. Manders, R.W. de Hoop & Shinatria Adhityatama (2019).
  Field Assessment Java Sea Survey of three Dutch WWII naval wreck sites in the Java Sea, Progress Report.
• S. Lovegrove/R.W. de Hoop/S. Adhityatama (2020).
  Good practice: international collaboration on shared difficult heritage.
  Sharing Heritage Expertise nr. 13.
• M.R. Manders/R.W. de Hoop/S. Adhityatama/D.S. Bismoko/P. Syofiadisna & D. Haryanto (2020).
  Battle of the Java Sea: One Event, Multiple Sites, Values and Views.
  Journal of Maritime Archaeology 2021.
• Hr.Ms. Kortenaer.
• The Battle of the Java Sea.
• Rear-admiral Karel Doorman.
• Australian War memorial.