The upper level of the command module, along with Slava himself, now had to be treated as contaminated, but they didn’t need it anymore. Jiro and Dinah would be confined to the lower levels, separated from Vyacheslav and the possible contamination by a sheet of plastic, until they reached Izzy or died. A common air supply circulated through all the levels in ducts, but it had a filter system, which they hoped would catch any floating motes of fallout.