After the last episode, right now I think the “away crew” is in the transporter pattern buffer during Calypso. Maybe they got thrown back in time during the temporal wars and the captain told Zora to wait out the 1,000 years in some out of the way location to avoid violating the laws against time travel and/or interfering with history or its place in the timeline. Whenever the time is up, Zora is to remove the crew from the buffer and return to headquarters, probably a short period after the crew got thrown back in time. That could also mean that the culprit behind the gravitational anomaly had something to do with the temporal wars. Calypso may be after the Burn but a decade or so before the setting for the current season.