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The outside water pressure increases with depth and so the stresses on the hull also increase with depth. Each 10 metres (33 ft) of depth puts another atmosphere (1 bar, 14.7 psi, 101 kPa) of pressure on the hull, so at 300 metres (1,000 ft), the hull is withstanding thirty standard atmospheres (30 bar; 440 psi; 3,000 kPa) of water pressure.
In this context, atmospheric pressure is considered equivalent to a depth of 10 meters. Absolute depth (m) = gauge depth (m) + 10 m. Depth measurement: Pressure monitoring devices. The pressure the is more important for structural and physiological reasons than linear depth. Pressure at a given depth may vary due to variations in water density.
6.3 kPa 0.9 psi Pressure where water boils at normal human body temperature (37 °C), the pressure below which humans absolutely cannot survive (Armstrong limit) [46] +9.8 kPa +1.4 psi Lung pressure that a typical person can exert (74 mmHg) [47] 10 4 Pa
It has a titanium pressure hull consisting of several conjoined spheres and able to withstand tremendous pressure — during the 2012 research mission it routinely dove to 2,500 to 3,000 metres (1.6 to 1.9 mi), [18] [19] with maximum depth being said to be approximately 6,000 metres (3.7 mi).
At Titanic depths, some 12,500 feet down, the water pressure is nearly 400 times more than at the ocean's surface — some 6,000 pounds would have been pressing down on every square inch of Titan ...
The new sphere was also steel, but smaller at 2.16 metres (7.1 ft) diameter and with thicker walls, at 127 millimetres (5.0 in), [5] calculated to withstand the 1,250 kilograms per square centimetre (123 MPa) pressure at the bottom of Challenger Deep plus a substantial factor of safety. The new sphere weighed 14.25 metric tons (31,400 pounds ...
The Titan has a carbon fibre hull that connects two titanium domes that can withstand the crushing pressure at a depth of 4,000m (OceanGate Expeditions)
Two weeks of public testimony concluded Friday in the U.S. Coast Guard's investigation to establish what caused the Titan submersible to implode during a deep ocean dive last year.