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Recreational diving services. Safety related minimum requirements for the training of recreational scuba divers - Level 1. Supervised Diver Ingestion-build-100580 Why should you use ISOBS EN 14153 1: 2003 Recreational diving services. Safety related minimum requirements for the training of recreational scuba divers. Level 1. Supervised Diver BS EN 14153 1specifies the competencies that a scuba diver has to have achieved in order for a service provider to award the scuba diver certification indicating that he has met or exceeded scuba diver level 1 Supervised diver and specifies assessment of these competencies. It also specifies