The Emergency Security Hologram or ESH is a sophisticated holographic program used aboard Starfleet ships and facilities in the latter part of the 24th century. Developed by Doctor Lewis Zimmerman and Reginald Barclay, the ESH was developed based on the success of the Emergency Medical Hologram programs. The first ship to use the ESH was the USS Galen, which also pioneered a number of other advanced holographic staff, including upgraded EMH staff and holographic engineers.
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