These images were taken about 7 years ago, thanks to the power of the internet I now know she's been sold and is now called "Hai Gong You 309" and at the time of posting she's about 200 miles north of the Falkland Islands heading south and looking to clear the Falklands to the east, there's no stated destination but she began that voyage after leaving the Las Palmas Anchorage. It would suggest that the current situation has left her, and doubtless many ships like her, rather short of cargoes.Just where is she bound now?
I think you're right. Portugal only has two submarines of any class, so it's got to be one or the other. In fact that's about 11% of the entire Portuguese navy you're looking at there, if we don't count coastguard vessels and suchlike. Good spot.Black and stealthy This is obviously quite a small diesel electric submarine, so not a UK vessel. She is flying the Union Jack as a courtesy but is also flying the Portuguese flag. Portugal has two 2000 ton submarines of the Tridente class with a crew of 33, so this is either the Tridente or the Arpao.