For most of this two-part story Voyager is under the control of Hirogen who hold the crew captive. Near the start of the story it is mentioned that the Hirogen have been on board for nineteen days.

Voyager accompanied by Hirogen ships
PART 1
By cutting through the bulkheads on Decks 4, 5, and 6, Kim expands both holodeck grids by 5,000 square metres, but he cannot give any more space without compromising Voyager's primary systems. Kim claims that holodecks require a tremendous amount of energy and he has already re-routed power from all non-essential systems - anything more and they will start losing propulsion, deflectors and even life support. The Hirogen transfers power nodules from his ship's systems and orders Harry to replicate emitters to expand the programming. Kim transfers the Doctor to a corridor using the new emitters.

the explosion at "Nazi H.Q." tears a hole in the holodeck; several of Voyager's decks can be seen through it
PART 2
Internal sensors indicate there are 85 Hirogen on board.
Over 800 hundred holo-emitters have been placed on Decks 5 to 12, turning Voyager into one big holodeck.
PART 2
A close-up of a corridor hatch into one of the Jefferies tubes is seen in this episode, pictured below (a similar hatch, each time the same one on the tv set, is used in several episodes e.g. [#118 Relativity]).

See under STARFLEET.
PART 1
During the attack (not seen on tv) in which the Hirogen capture Voyager, the Hirogen breached Voyager's hull and entered the ship through that breach. They have damaged just about every system on the ship. With the holodeck safety protocols off, a simulated explosion in holodeck 1 blows out the hologrid across three decks. The breach opens the simulation into surrounding sections and leaves program controls offline.
PART 2
The visual link is the last of the active circuits connecting the bridge to the holodecks.
Sickbay is damaged by the explosion set by Janeway and Chakotay. The damage to Voyager is extreme.
A power surge across the holoemitter network blows the system, ending the simulations (although the Sainte Claire environment, without holocharacters, remains).
PART 2
The optronic datacore given to the Hirogen is as per a optronic datacore from a Galaxy-class starship (specifically USS Enterprise NCC-1701-D) seen in [TNG: Ship In A Bottle] (it is the exact same prop). The consequences of giving holographic technology to the Hirogen will feature in the Season 7 story [#155 and #156 Flesh and Blood] in which the holographic prey created by the Hirogen revolt.

the optronic datacore
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