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6 sourced facts about scuba diving, each with the context behind the number. 4 more are in today's round and appear here after it closes.
The basics
Underwater, pressure increases by one atmosphere for roughly every how many feet of depth?
Answer33 feet (10.06 meters)
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
What is the Guinness World Record for the deepest scuba dive?
Answer332.35 m (1,090 ft 4.5 in)
Egypt's Ahmed Gabr set it in the Red Sea off Dahab in 2014.
Source: Guinness World Records (2014) (2014) guinnessworldrecords.com
Going deeper
About how many PADI dive centers and resorts are there worldwide?
Answer6,600
PADI also counts 128,000 professional members worldwide.
Source: PADI, About PADI padi.com
Ahmed Gabr reached his record 332 m depth in about 12 minutes. How long did it take him to return to the surface?
Answernearly 15 hours
The slow ascent was needed to manage the risks of the extreme water pressure at such depths.
Source: Guinness World Records (2014) (2014) guinnessworldrecords.com
Expert level
The previous deepest scuba record, set by Nuno Gomes in 2005, was how deep?
Answer318.25 m (1,044 ft)
Gomes also set his record off Dahab, Egypt; Gabr beat it by about 14 meters.
Source: Guinness World Records (2014) (2014) guinnessworldrecords.com
How deep is Challenger Deep, the deepest known point in the ocean?
Answerabout 10,935 m (35,876 ft)
By comparison, the average ocean depth is about 3,682 meters.
Source: NOAA Ocean Service, How deep is the ocean? oceanservice.noaa.gov
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