Strauss insisted that the maximum containment facility in the basement of the building be opened and used for all future work. It was agreed that only Anderson and Myra Freedman would work there, with a supply of lab animals being put in for them. Anderson was depressed at the thought of having to work under the restrictions imposed by the containment suite but agreed that it was now imperative. Such facilities were designed for work with the most highly dangerous materials where the prime consideration was to prevent their escape to the outside world. The first line of defence in the system was the use of differential air pressure. The suite was constantly maintained at a lower atmospheric pressure than the area surrounding it so that no air could escape. People working in the suite had to get in and out, of course, but such movement was restricted by the elaborate entry and exit procedures which demanded that workers remove all their outside clothes and pass through a series of airlocks and showers before donning the masks, coveralls and boots they would wear for the duration of their work period.
