A Mir technician manually inspects the O-ring that will keep the scientists from being exposed to the elements at 3800 meters below the sea surface.
O-Ring
Image courtesy of the RMS Titanic Team Expedition 2003, ROI, IFE, NOAA-OE. Download larger image (jpg, 2.1 MB).

A Mir technician manually inspects the O-ring that will keep the scientists from being exposed to the elements at 3800 meters below the sea surface.