depth
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The Descent
Scroll down. Everything in the blue panels is real and sourced; everything in the amber panels is invented — a survey that never happened, from a ship that does not exist.
↓ 10,935 metres ↓
Scroll down. Everything in the blue panels is real and sourced; everything in the amber panels is invented — a survey that never happened, from a ship that does not exist.
Surveys of the Challenger Deep disagree by tens of metres, because the answer depends on the sonar and on the sound-speed model used to turn echo timings into a depth: 10,920 ± 10 m (Takuyo, 1984), 10,994 m (USNS Sumner, 2010), 10,925 m (RV Sonne, 2016), 10,935 ± 6 m (2021). This page uses the last of those. Pressure on the gauge is calculated from depth — about one extra atmosphere per ten metres of seawater — and is not a measurement. The temperature line is a typical open-ocean profile rather than a reading from any particular place, and the daylight figure is an idealised curve for clear open water.