sentences:  The watch used during this scientific record dive, where a hydrogen-helium-oxygen (hydreliox) gas mixture was used as breathing gas, was a Rolex Sea-Dweller 16600 with a depth rating.Rolex used this achievement in advertising campaigns.The complexity, medical problems and physiological limits, such as those imposed by high pressure nervous syndrome, the accompanying high costs of professional saturation diving to extreme depths and the development of deep water atmospheric diving suits and remotely operated underwater vehicles in offshore oilfield drilling and production effectively ended the need for ever deeper, non-atmospheric manned intervention in the ocean.