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What is the deepest depth a submarine can go?

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A small submarine, the bathyscape Trieste, made it to the deepest point in the ocean, the Challenger Deep in the Marianas Trench, a few hundred miles east of the Philippines, 10,916 meters (35,813 ft) below sea level. So clearly a submarine can make it as deep as it's even theoretically possible to go. The water pressure at this depth is over 1000 atmospheres. Life does exist here, as well as a carpet of diatomaceous material that covers all the ocean floors of the world. As the Trieste has long been dismantled, there currently exists no manned or unmanned craft capable of making it to this depth. Trieste was manned by two people and funded by the United States Navy. The pressure sphere used was 2.16 m (6.5 ft) across, with steel walls 12.7 cm (5 inches) thick, able to withstand 1.25 metric tons per cm² (110 MPa) of pressure. The pressure sphere of Trieste, which weighed 8 metric tons in water, was not neutrally-bouyant because the steel had to be so thick for a 2 m-sized sphere at ... more
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A small submarine, the bathyscape Trieste, made it to the deepest point in the ocean, the Challenger Deep in the Marianas Trench, a few hundred miles east of the Philippines, 10,916 meters (35,813 ft) below sea level. So clearly a submarine can make it as deep as it's even theoretically possible to go. The water pressure at this depth is over 1000 atmospheres. Life does exist here, as well as a carpet of diatomaceous material that covers all the ocean floors of the world. As the Trieste has long been dismantled, there currently exists no manned or unmanned craft capable of making it to this depth. Trieste was manned by two people and funded by the United States Navy. The pressure sphere used was 2.16 m (6.5 ft) across, with steel walls 12.7 cm (5 inches) thick, able to withstand 1.25 metric tons per cm² (110 MPa) of pressure. The pressure sphere of Trieste, which weighed 8 metric tons in water, was not neutrally-bouyant because the steel had to be so thick for a 2 m-sized sphere at ... more
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