NAUI Advanced Open water Diver or equivalent. For this course, equivalency is proof of certification beyond entry level with experience in deep diving and underwater navigation.

NAUI进阶潜水员或相同等级的潜水员。潜水员必须提出相关证照以证明有超越基础入门之深潜与水中导航的实际经验。

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"I already have a masters degree in physics and astrophysics a PhD in astronomy, I'm a scuba diver, I speak basic beginner's to advanced Russian, and I have flying experience, " one hopeful, Tracy Parker, tells CNN.

CNN: Middle aged spacemen needed for moonshot