After splashdown at 4:51 pm on 24th July 1969 the Apollo 11 astronauts returning from the first moon landing  had to don full-body Biological Isolation Garments before they could leave the conical command module that was bobbing in the Pacific Ocean. Having transferred to the dingy that had come to meet them, Neil Armstrong, Buzz Aldrin and Michael Collins then had to scrub one another’s suits with diluted bleach.