the need neidl is one of those places. in boston i'm standing in front of a $2-00 million facility, a biosafety building for lab, a prison for pathogens like the ebola virus. we have been granted access before it goes hot - that is plays host to the world's most lethal viruses. >> people call the containment lads containment on steroids, because of the enormous number of redundancies and safety measures. tour. >> you are walking around the outside of the biosafety level. the people inside are working with bio safety level two ates in preparation for getting the laboratory operational. >> reporter: inside researchers wear air-tight positive pressure suits, also known as space suits, and have their own separate air supply. >> what makes a bio safety level 3. >> the key one is engineering. buildings have to be built as a continuous pour concrete, so heb you decontaminate you can fill them with hydrogen peroxide and destroy everything in the room. >> reporter: it's a building within a building. >> yes. >> reporter: the bsl-4 h