Talk:Diving bell

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[edit] Depth problems

"Such problems occur at a pressure over two atmospheres, experienced below a depth of 20 metres (32 feet)." - Which is it, 32 feet or 20 meters? 20 meters is 66 feet. -Riedquat (talk) 19:00, 28 November 2007 (UTC)

i will also point out that it says 'over two atmospheres' And 'below a depth of 20 meters' 10 meters of water exerts a pressure of one atmosphere, but the air above it exerts one also, making the pressure at 10 meters 2 atmospheres [29.4 Psi or 2 BAR.]

the pressure water exerts at 20 meters is therefore 3 atmospheres [44.1 Psi or 3 BAR.]

One other point... all Dives shallower than 10 meters are planned as though 10 meters. [when accounting for nitrogen build up] which means nitrogen does build up in the body shallower than 10 meters [two atmospheres] and can still cause problems if total bottom time overruns non decompression limits.