What record did the nereus break in may 2009? a) it became the first remote operated deep-sea robot. b) it dove to a depth of 6.8 miles. c) it explored an undersea mountain. d) it took the first videos of deep sea organisms. e) it took the first sediment sample from the ocean floor.

Engineers at the Woods Hole Oceanographic Institution (WHOI) rejoiced on May 31, 2009, as the unusual Nereus vehicle descended to a depth of 10,902 meters (6.8 miles) in the Mariana Trench of the western Pacific Ocean. On this dive, the Nereus submerged to a depth of 35,768 feet, making it the deepest diving vessel currently in use and the first to explore the Mariana Trench, the deepest known region of the ocean, since 1998. Nereus can dive to great depths and is extremely maneuverable thanks to a lightweight, thin, fiber-optic tether that its pilots aboard a surface ship use to control it remotely.

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