This course introduces the purpose, operation, and application of Subsurface Safety Valves. Case studies demonstrate the need for setting the valves at certain depths. Environmental complications encountered in sub-sea installations, arctic conditions, extreme temperatures, and even earthquake-prone regions are covered. Surface and subsurface controlled downhole safety valves are described, accompanied by detailed animations and graphics demonstrating the valves’ operation. Students operate a surface control panel and see the effect of each action downhole.