HMS Opportune (S20) [SEP] vessel class
What type of aquatic unit is HMS Opportune (S20)? What vessel type is HMS Opportune (S20)? What specific type of seafaring vessel was HMS Opportune (S20)? What type of submarine was HMS Opportune (S20) classified as?
Oberon-class submarine
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Section::::Abstract.
HMS Opportune (S20)
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