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David Polley

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David Polley
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    Head of DJL Technical Diving Department

Technical, Trimix, Cave & Advanced Wreck Instructor

David has over 10 years experience as a dive instructor teaching in a wide range of aquatic environments. Dave began his professional dive career in the UK as a dive instructor whilst studying for his degree in Environmental Biology at University of Bath. He joined DJL Tec in 2011 and now manages the DJL Technical Department.

David leads the DJL technical facility ensuring high standards are maintained across all technical operations. David is responsible for all technical programs, teaching tri-mix gas blending, compressor operations, regulator and equipment servicing certifications. He also runs regular cave diving trips, teaching cave diving courses and leading experienced cave divers into the many deep caves found on the mainland such as Song Hong and Sra Keaw. David runs DSAT and PADI TecRec programs and has written some PADI diving courses such as Advanced Wreck. He is a BSAC Advanced Mixed Gas Instructor and teaches the whole range of BSAC tech courses. David is also a TDI Instructor teaching intro to cave, advanced nitrox and decompression procedures courses.

As an experienced British Wreck Diver his main interest is in deep wreck expeditions, and exploring the many WWII wrecks in the Gulf of Thailand. David regularly leads expeditions to dive the many Japanese ‘Maru’ shipwrecks sunk in WWII and other wrecks scattering the gulf. David is also an experienced cave diver and a member of team ‘TMx Explorers’ carrying out wreck exploring expeditions and surveying.


  • B.Sc. (Hons) Environmental Biology

Teaching Qualifications:

  • PADI Master Instructor #632725
  • DSAT TEC Deep Instructor
  • DSAT TEC Deep Tri-mix Instructor
  • DSAT TRI-Mix Gas Blender Instructor
  • Advanced Wreck Instructor
  • Cave Instructor
  • TDI Advanced Nitrox instructor
  • TDI Deco procedures instructor
  • BSAC Advanced Tri-Mix Instructor
  • Dry Suit Instructor
  • Emergency Oxygen Provider Instructor
  • Underwater Videographer Instructor
  • Equipment Specialist Instructor
  • Diver Propulsion Vehicle Instructor
  • Underwater Photographer Instructor
  • Project Aware Instructor
  • Emergency First Response (EFR) and Care for Children and AED Instructor

Diving Certifications:

  • TDI Full Cave Diver
  • Trimix CCR Diver
  • GUE Fundamentals Diver
  • Apeks Service Technician
  • BSAC Compressor Instructor


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