A good idea, I like that, especially the pipe insulation.
Right, I started my cave training in the UK and was requested to wear a helmet. Completed it in Mexico and everybody was wearing helmets. Even Russians and Chinese. Go figure.
The logic would suggest that a beginner would need a helmet more than a seasoned diver as he or she has a higher risk of hurting the head.
My British instructor friend in a helmet. BTW he uses to dock his primary umbilical lighthead on the helmet when he needs to remove it from his hand.
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