Episode Behind the Scenes

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The working title for this episode was Down Deep.
The episode's development had a watery starting point. During the fifth season of Star Trek: Voyager or in the hiatus shortly thereafter, script writer and producer Kenneth Biller explained, "Scott Miller brought us this idea a couple of years ago of an ocean in space. Brannon [Braga] and Joe [Menosky] and I fell in love with the image." The writers then attempted to come up with a workable story to feature their oceanic muse.
Whether or not Robert Duncan McNeill was personally involved in the development of the episode's subplot, he approved of its addition. He remarked, "The first version of that episode I didn't like [....] [We had] an opportunity to look [...] at it and say, 'How can we improve it?' The whole concept of Paris being in the brig from the beginning, and telling this as a flashback in a letter to his father, brought in a whole other element that was much darker and much more interesting. This was more complex; it had a lot of character stuff to play with. All those scenes with Paris in the brig gave it a framework that was much more interesting, and had much more mystery to it. I was very happy with it by the end. I thought it turned into a really good show."
The set representing the inside of Captain Proton's rocket ship, as seen here, reused a set of water bubble tubes from the fourth season finale "Hope and Fear".
The scenes in which the imprisoned Paris recounts the story for his father were shot after the filming of the episode's other scenes.
For this episode, a shot of the Delta Flyer launching from Voyager's shuttlebay and approaching the waterworld, while banking to starboard, was reused from the earlier Season 5 outing "Extreme Risk", simply with a different planet composited into the shot.
Ken Biller was ultimately dissatisfied with all the efforts the writers made to develop a plot conceptually centered around "an ocean in space." He complained, "Unfortunately, we never quite figured out the best way to tell a story about it." However, Biller thought some of the other aspects of this episode were successful, including the subplot involving Paris' imprisonment. "That ended up being the most interesting thing," he remarked. "I thought the special effects were great and the ocean was intriguing."
After five years of references, the infamous Delaney sisters appear for the first and only time. They are only seen in holodeck-attire, however a reception scene where both are dressed in sciences division uniforms was filmed and deleted from the episode. Publicity stills for the episode were distributed of both actresses from this scene.
Because of his actions in this episode, Tom Paris is reduced in rank to ensign. This is the second time in the Star Trek franchise that a main character is demoted in rank; the first occurs in Star Trek IV: The Voyage Home, when James T. Kirk is demoted from admiral to captain. Paris later regains his rank of lieutenant junior grade in the sixth season finale "Unimatrix Zero".
One of the pieces of equipment Riga brings with him was also seen in VOY: "Dark Frontier" as the "auto regeneration unit" Harry warns Janeway off of.