Star Trek: Voyager Rewatch: "Unforgettable"
Stardate: 51813.4 Captain’s log. Voyager finds itself proximate to a firefight, though they can only detect the results of the weapons fire, not the actual battle itself. Seven theorizes that the combatants are cloaked, which proves to be the case when one ship blows up the other one. The surviving ship’s occupant is a woman named Kellin, who contacts Voyager and asks for Chakotay by name. They can’t get a transporter lock on her, and so Chakotay leads a team over to the ship. He rescues Kellin from being stuck under fallen debris and then transports back to
Source: tor.com