A large North Korean fishing vessel supposedly scrapped years ago reappeared last month, state media showed, renewing uncertainty over just how well ship trackers can monitor the country’s commercial fleet.

The ship in question is the Sam Chon Li 1 (IMO 6807967), a 3,800-ton trawler that last broadcast over its automatic identification system (AIS) in late 2018 with an unknown destination, according to maritime intelligence platform MarineTraffic.

MarineTrafficrecords show the ship is either “decommissioned or lost,” suggesting it had been scrapped. The ship also only appears in the International Maritime Organization’s (IMO) “advanced” search function, which an IMO spokesperson