2. Tuvok is closely examining a tiered structure filled with liquid, but the structure was created using Federation technology.
From Quiz Name That Episode #4
Answer:
Caretaker
Voyager's pilot episode had a lot of memorable scenes, and one of the more humorous moments is when Tuvok enters Neelix's quarters while Neelix, who hadn't had the luxury of plentiful water before Voyager's arrival, is taking a bath. Apparently, Neelix was so ecstatic to have water that he constructed a display consisting of glasses filled with water stacked on top of each other, which Tuvok observes curiously for a moment before walking further inside. It has to be assumed that Neelix used the replicator to make those glasses of water, but it's also possible that he used glasses that were already in his quarters and used the water from his sink to fill the glasses. In either event, Federation technology was definitely involved in some way. In "Hope And Fear", the only thing Tuvok is examining is the specs of the U.S.S. Dauntless itself, a booby-trapped Federation vessel created by a scheming Arturis who wanted to avenge his people being destroyed as a result of the war between the Borg and Species 8472, when Tuvok and the away team first transports over to it. There were no tiered structures of liquid of any kind to be seen. In "Future's End, Part 2", Tuvok isn't doing any examining. Though in Part 1, he did poke around a little in Rain Robinson's observatory at the Chronowerx building in 1996 Los Angeles, but there were no kind of tiered structures of liquid to be observed. In "Concerning Flight", Tuvok never examines any constructions filled with liquid while in Da Vinci's workshop nor while on the alien planet where Voyager's stolen supplies have been taken to.