Submarine 'NRP Tridente' of the Portuguese Navy returning to the Lisbon Naval Base at Alfeite in the early morning hours.

Main characteristics:
Class: Trident
MMSI: 263028000
Callsign: CTSA
LOA: 67,9m
Beam: 6,3m
Draught (at surface): 6,6m
GT (at surface): 1842 t
Max. speed (at surface): 10 kts
Year of Build: 2010
Builder: HDW (Kiel, Germany)
Flag: Portugal
Crew: 33