Deep space referred to more empty regions of space, between stars or galaxies.

Sector 16 (TV: Earthshock) and the fifty-fourth sector of chartered space existed in deep space. (PROSE: The Dimension Riders)

When travelling through deep space, one could experience deep space sickness. (TV: The Space Pirates) Oxygen and water were considered precious things while in deep space, as anyone having undergone space travel training would know quite well. Space Station W3 was, among other things, a stopping point for deep space ships. (TV: The Wheel in Space)

A Dalek deep space cruiser was six hours away from Skaro when Davros wanted to escape the Movellans. (TV: Destiny of the Daleks)

The Eye of the Storm, a scientific research station, was in deep space. Experiments with a wormhole bomb inadvertently created a Zero Space in the area around the station, devoid of anything. (AUDIO: Zero Space)

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