Oceanic trench the level of the surrounding oceanic floor. The greatest ocean depth measured is in the Challenger Deep of the Mariana Trench, at a depth of below sea level. Oceanic lithosphere moves into trenches at a global rate of about 3 km/yr. There are approximately of convergent plate margins, mostly around the Pacific Ocean—the reason for the reference “Pacific-type” margin—but they are also in the eastern Indian Ocean, with relatively short convergent margin segments in the Atlantic Ocean and in the Mediterranean Sea. Globally, there are over 50 major ocean trenches covering an area of 1.9 million km or about 0.5%
Second Battle of the Java Sea discovered that the wrecks of HMS "Exeter" and HMS "Encounter" were missing from the ocean floor. The Guardian newspaper subsequently reported that the wrecks of HMS "Exeter", HMS "Encounter", and part of HMS "Electra", as well as the submarine USS "Perch" were missing and presumed illegally scavenged. Commenting on their removal, one of the men involved in their original discovery is stunned at the magnitude of the salvaging that appears to have taken place. Second Battle of the Java Sea The Second Battle of the Java Sea was the last naval action of the Netherlands East Indies campaign, of 1941–42.