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How well do you know scuba diving?

Guess the real numbers behind diving and the deep, see how everyone else guessed, and get the source.

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Sunlight can reach 1,000 meters down, but beyond what depth is there rarely any significant light?

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Two scuba divers enjoying a swim in clear ocean waters, near a scenic coastline.
Photo: LN Dangol / Pexels
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Today's round

  • 4 stats to guess
  • 1 opinion poll
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Guess, see the crowd, get the real number. One ranked attempt per day.

Dive by the numbers

Real figures with their sources. All Dive facts →

33 feet (10.06 meters)

Underwater, pressure increases by one atmosphere for roughly every how many feet of depth?

At sea level, air already presses on us at 14.7 pounds per square inch — you feel the change on your eardrums within a few feet.

Source: NOAA Ocean Service, How does pressure change with ocean depth? oceanservice.noaa.gov

332.35 m (1,090 ft 4.5 in)

What is the Guinness World Record for the deepest scuba dive?

Egypt's Ahmed Gabr set it in the Red Sea off Dahab in 2014.

Source: Guinness World Records (2014) (2014) guinnessworldrecords.com

1966

In what year was PADI, the Professional Association of Diving Instructors, founded?

Founders John Cronin and Ralph Erickson set out to raise professional standards in dive training.

Source: PADI, About PADI padi.com

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How does DiveSurvey.com work?

Each question asks you to guess a real number about scuba diving. After you answer you see how everyone else guessed, then the real figure and where it comes from.

How is the daily round scored?

Four stats and one opinion poll. A correct guess earns 100 points plus up to 50 for speed, with a combo bonus for answers in a row. The range next to the right answer earns 40. Opinion polls earn 25 for having your say, and nailing every stat adds 150.

Where do the numbers come from?

Every stat links to its source, such as government statistics agencies, research organizations and industry groups. Figures are checked against the source before they go live.

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