Viking HD is the strongest suit made by Trelleborg, (1500g/m2) it's used by professional divers, who need to dive in sewers, nuclear reactors, etc, and where durability and safety is a main factor.

The diver shown on the right, has been in a oil tank, for doing some maintenance work. As you can see, the job was very dirty, therefor he use strong rubber gloves and a AGA Full Face Mask, for complete sealing from the water/oil mixture and the suit is fitted with the Turbo Hood, which is as hood, special constructed for diving in hazardous substance. In addition to the normal SCUBA Tanks, he also is able to get air from an Airline System.

More about contaminated water diving

The AGA-Mask is often used when diving in contaminated water, it's provides an extra safety- feature, the regulator provides an over-pressure in the mask, therefor a little leak in the sealing between the mask and the divers face, isn't critical. If a diver have to dive in very contaminated water, the diver often use a helmet with Air-supply from the surface. The suit will always be a Rubber suit, this suit has an easy surface to clean and decontaminated. Neoprene suit is not recommended for diving in contaminated water, the suit is almost impossible to decontaminated 100%, because of the material-structure.

See also Hazardous Environment Diving