The requested vessel with name SIGA SIGA and MMSI:235035607 and IMO:0 is temporary not in our database.
Perhaps you mean one of the following ships:

Vessel name IMO MMSI In range Destination Last report
SIGA SIGA N/A 244790762 Feb 17, 2018 20:26 UTC

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