HMS Opportune (S20) [SEP] vessel class
HMS Opportune (S20)
HMS "Opportune" (S20) was an "Oberon"-class submarine of the Royal Navy. 
Design and construction.
The "Oberon" class was a direct follow on of the "Porpoise"-class, with the same dimensions and external design, but updates to equipment and internal fittings, and a higher grade of steel used for fabrication of the pressure hull.
As designed for British service, the "Oberon"-class submarines were in length between perpendiculars and in length overall, with a beam of ,
Opportune
Opportune may refer to:
- HMS "Opportune" (S20), an "Oberon" class submarine
- USS "Opportune" (ARS-41), a "Bolster"-class rescue and salvage ship
See also.
- Opportunity (disambiguation)
- Sainte-Opportune