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There are three main types of deep sea submersibles, manned unmanned and Autonomous. They all have different ability’s and limitations but the main purpose is to explore the deep depths of the ocean floor. The use of these submersibles is a good step toward increasing the safety of the people who work in the ocean. The manned submersibles such as The Alvin can go down 4500 meters and show researchers the bottom of the ocean. The Alvin is 40 years old and has dived on the Titanic. When the Alvin is in the water it has a support ship that has to stay nearby in case anything goes wrong. These subs are often used to explore accidents that occur in the ocean. The Nautile was used to determine if a tanker that sank off the coast of Spain was leaking the oil that it was carrying. The remote controlled or unmanned subs such as Jason II and Medea which is one submersible in two parts can travel to depths kilometers below the surface they are connected by a 135 meter tether this allows for Jason II to maneuver without being affected by the movement of the ship above. The difficulties with a ROV is that it can only go as far as the tether though that is not a problem but the tether can break and then the UMV is stuck with no power and no controls at the bottom of the sea. Abe is one of the most advance deep sea submersibles in the world. It has no pilot either in it or on a ship standing by it is piloted by a preprogrammed computer program the only job. This type of submersible is very expensive because of the entire computer program that is needed to run it and operated it in to it. Or the three types of submersibles the fully automated ones are the most expensive but can do the most work uninterrupted