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Stuart Scuba · Daily Trivia Archive

October Trivia

Questions are listed by date with the answer, a short explanation, and a source.

October 26, 2026 · Open Water

At 10 meters (33 feet) in seawater, how much pressure is added by the water?

Answer: About 1 atmosphere (approximately 1 bar) of water pressure.

Explanation: At 10 meters in seawater, the water adds about 1 atmosphere of pressure. Add the atmosphere at the surface and the total pressure is about 2 atmospheres.

Source: PADI — Diving Physics: Pressure

October 27, 2026 · Technical diving

Which gas joins oxygen and nitrogen to make the breathing mixture called trimix?

Answer: Helium.

Explanation: Trimix contains oxygen, nitrogen and helium. Replacing some nitrogen with helium reduces the narcotic effect of the breathing mix. Helium also lowers gas density, helping reduce the effort needed to breathe at depth.

Source: Divers Alert Network — Breathing Gases

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