The requested vessel with name SOUTHERN SEAS and MMSI:0 and IMO:5335620 is temporary not in our database.
Perhaps you mean one of the following ships:

Vessel name IMO MMSI In range Destination Last report
SOUTHERN SEAS 301 9764415 557005500 Feb 20, 2018 10:37 UTC
SOUTHERN SEAS NO.302 N/A 557005600 Nov 28, 2016 11:55 UTC
SOUTHERN SEAS NO.303 N/A 557005700 Sep 30, 2017 03:20 UTC

Also, you may try to find the vessel in our comprehensive Vessels Database or track this ship on the map.