The UNSC Atlantis is a deep-sea submersible originally designed by the UNSC Navy and later operated by the UNSC Special Operations Command and the UNSC Office of Naval Intelligence. It is a small, self-contained deep-sea submersible capable of withstanding pressures in the gPa (giga pascal) range, tens of thousands of times higher than Earth's atmospheric pressure, and the Atlantis is believed to be able to dive to a depth of sixteen thousand feet, below the deepest trench in Earth's oceans (the Mariana Trench), but well within range of the trenches of other planets. The UNSC Navy originally designed the Atlantis for manned exploration of oceanic depths for research purposes; later the UNSC Medical Corps and Acumen Science Laboratories would be highly interested in collecting biological sa