Russian Mir pilot Genya Chernaiev explains the mechanics of how the submersible descends to 3800 meters.
Genya Chernaiev
Image courtesy of the RMS Titanic Team Expedition 2003, ROI, IFE, NOAA-OE. Download larger image (jpg, MB).

Russian Mir pilot Genya Chernaiev explains the mechanics of how the submersible descends to 3800 meters.