Voyager is depicted as being severely damaged in this show. To achieve that effect without lasting damage to any of the permanent sets, acrylic sheets similar to those used when the sets are in storage was draped over most of the "clean" bulkheads, and were then sprayed with charcoal dust to simulate the effects of multiple explosions. Unfortunately this resulted in many surfaces having a "wrinkled" appearance.
Main engineering is not seen through this serial. Neither is sickbay; to reduce the costs associated with preparing the sets to be seen as battle-damaged, the writers were asked to place the action on as few of the Voyager standing sets as possible. As such, the events aboard the ship take place almost entirely within the corridors, the bridge, and the mess hall.
This serial was inspired greatly by Jules Verne's "20,000 Leagues Under The Sea". The name of the character Annorax was derived from the main character of that story, Pierre Aronnax. Tom Paris even compares Annorax to Captain Nemo, the antagonist of Verne's story.
Peter Slutsker (now known as Peter Marx after changing his name) has played the roles of Nibor in TNG "Ménage a Troi", Dr Reyga in TNG "Suspicions", Birta in TNG "Bloodlines", and Krenim Commandant in Voyager "Year of Hell Part 2".
This episode is the second to feature the complete destruction of Voyager, and is the fifth of many times Janeway "dies" in the series. On this occasion, she dies along with the destruction of Voyager.