Sunda Trench an underwater ridge, and much of the trench is at least partially filled with sediments. Mappings after the 2004 Indian Ocean earthquake of the plate boundary showed resemblance to suspension bridge cables, with peaks and sags, indicative of asperity and locked faults, instead of the traditional wedge shape expected. Some of the earliest exploration of the Trench occurred in the late 1950s when Robert Fisher, Research Geologist at the Scripps Institution of Oceanography, investigated the trench as part of a worldwide scientific field exploration of the world's ocean floor and sub-oceanic crustal-structure. Bomb-sounding, echo-train analysis and manometer were some of
Battle of the Trench the Banu Qurayza tribe, leading to their surrender and enslavement or execution. The defeat caused the Meccans to lose their trade and much of their prestige. The battle is named after "trench", or "khandaq", that was dug by Muslims in preparation for the battle. The word "khandaq" () is the Arabised form of the Persian word "kandak" (meaning "that which has been dug"). Salman farsi the Persian advised Muhammad to dig a trench around the city. The battle is also referred to as the "Battle of Confederates" (). The Qur'an uses the term "confederates" () in sura "Al-Ahzab" to denote