ISS EVA 23 Suit Water Intrusion Safety Message April 07, 2014 Listen as William Gerstenmaier, associate administrator for Human Exploration and Operations, presents the April Safety Message on the ISS EVA 23 Suit Water Intrusion. More Videos Feature Videos Learn about the Office of Safety and Mission Assurance, its disciplines and programs, and much more in these feature videos. Safety Messages Guest speakers deliver the monthly Safety Messages in these live recordings. Knowledge Bytes These short videos provide expert insight on various safety and mission assurance topics. Policy Bytes Policy owners explain recent changes to policies and standards in these short videos. Event Videos Video captures of live events on Safety and Mission Assurance topics.