'...The three men working in these chambers wear completely sealed diving-suits of plastic material, provided with 40 feet of stainless steel air-lines. On entering the chambers the operators are hermetically sealed in their diving suits and are then given a shower-bath in antiseptic for fifteen minutes. They are then totally immersed for half an hour in tanks of 3% formalin containing detergent. Any imperfections in the diving-suit soon become apparent either by the escape of bubbles or by the effect of the formalin on the occupant...'
