The requested vessel with name SEAMERCURY and MMSI:0 and IMO:7921825 is temporary not in our database.
Perhaps you mean one of the following ships:

Vessel name IMO MMSI In range Destination Last report
SEAMERCURY 9260005 229388000 MALTA FOR ORDERS Feb 24, 2018 02:29 UTC
SEAMERCURY N/A 229388012 ROTTERDAM Oct 12, 2017 22:17 UTC

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