The Shackleton Energy core team has literally “written the book” on the general use of long range, redundant computer-controlled closed cycle portable life support systems (PLSS) in hostile environments.  During the past 30 years SEC founders have been involved in the development of seven generations of fully closed cycle electronically controlled underwater life support apparatus.  The Mk7 (aka “Se7eN”) is a commercially available recreational diving unit weighing 15 kg with a range of 6 hours at 60m depth.  More than 3,000 units have been manufactured and sold by Poseidon Diving Systems, Sweden as of 2014 under license.  From the very start SEC founders realized that existing space systems EVA PLSS units were unsafe for long range, remote missions.  Beginning in 1984 design efforts began to develop a 2-day PLSS that was completely redundant and would allow for bailout in closed circuit operation -- something no space suit (government or private) has ever achieved. SEC developed an original design that included twin gas processors, four onboard computers, and the ability to manually cross connect the two halves of the system in the event of emergencies underwater.  It weighed 100 kg and had a range of 48 hours.  This was used dramatically on December 3 and 4 of 1987 when SEC co-founder Dr. Stone spent 24 hours continuously underwater using the prototype device.  Over the following 27 years the system was continuously improved upon.  Tens of thousands of missions (underwater dives) have been logged all over the world -- proof enough that the architecture works and is reliable for general use, but also that the 150,000 lines of onboard code that runs the core systems is fully debugged.  A fully redundant version of the Se7eN system employs full closed-cycle bailout capability and a 12 hour range... far greater than any existing spacesuit PLSS, along with onboard real-time decompression management, consumables supervisor, head-up displays, and manual override capability.  In short, it is designed for long range industrial operations with direct implications for both ECLSS and EVA PLSS space systems that SEC will develop as part of its LEO and lunar operations equipment.