Dr Jeff Zhang's Groups (5)

  • China Divers

    9 members Latest Activity: Dec 31, 2015 This is a local group for Chinese divers communication.

  • SAT Divers

    117 members Latest Activity: Jan 27, 2017 For all you SAT divers...

  • Diving Helmet Collection

    20 members Latest Activity: Apr 30, 2017 Diving helmet collection community, share information and exchange of collections.

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