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Jeff and Ben take on four obscure questions in technical scuba diving:

• Why nitrox 50 from 160ft/48m but oxygen from 130ft/39m?
• Why are all the deco and stage cylinders on the left?
• Why do we only carry one bottom timer?
• Why do we use SPG's, not electronic transmitters?

This, plus dozens of tangents and shiny objects. Although the topics are founded in technical diving, they are appropriate to diving at every level, so regardless of your training or experience, there should be something for everyone here.