Holodeck

Entertainment, Training, & Investigative Descriptions

in 2261, a prototype holodeck had been developed, but malfunctioned

By 2364, the tech had improved enough to allow Starfleet to install them on ship

Enable holographic projections; through photons contained within force fields

Could generate holographic images that appeared to extend for an unlimited distance

Equipped with safety protocols to prevent serious injury, could be turned off

Required their own power source, separate from all other ship systems