IANTD Gas Blending Technician, TDI Trimix Diver,
IANTD Overhead Environment Diver, IANTD Advanced Nitrox Diver,
TDI Extended Range Diver, TDI Closed Circuit Rebreather Diver.

Health and Safety Executive Part One (Commercial Diver)

Accept no imitations - the one and only 'CHIEFTAN'