Scuba Divers... I Need Your Brains

Eeneymush | 16:02 Fri 28th Aug 2015 | Sport

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Here's the thing, I am actually looking for an explanation rather than the answer so please bear with me...

I have recently been given a Dive leader test paper as I have recently joined a dive club.

The question I am stuck on is about diving at altitude and using the BSAC 88 tables.

'you are with a trainee Ocean Diver using BSAC 88 tables in 18, deep inland quarry, 120 m above sea level. the breathing gas is air, the regional atmospheric pressure is 990mb. the first dive was to 18m with a dive time of 30 mins, work out the surface interval required for a second dive to 15m for 30 mins.

I have the tables and can understand that the atmosphere and altitude will have to be taken into account, but don't have any way of working this out..

please help...

Eeney

Where Are The Aussies?

Gaa

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