A Devonport-based frigate has been involved in a drugs bust which found more than a tonne of cocaine.
HMS Argyll's commander said he was delighted at the second seizure
HMS Argyll helped intercept the offshore supply vessel MV Orca II off west Africa on Monday.
Spanish Customs agents found 1.3 tonnes of the drug, worth nearly £60m, on the ship which is now being taken into a Spanish port.
HMS Argyll was also involved in the seizure of two tonnes of cocaine from another ship in October.
The 950-tonne Orca was stopped 360 miles off the Cape Verde Islands.
The drugs bust was directed by the UK's Serious Organised Crime Agency (Soca) working with Spanish Customs.
HMS Argyll, the Royal Fleet Auxiliary supply ship Fort Austin, Sea King helicopters of 849 Naval Air Squadron and Royal Marines from 40 Commando were involved in the latest in a series of interceptions of hauls headed from Latin America to Europe and the Spanish mainland.
HMS Argyll, again working with Spanish Customs and Soca, and with the tanker RFA Gold Rover, seized 1.8 tonnes of cocaine on the MV Ster II 1,600 miles south of the Canary Islands in early October.
HMS Argyll shadows the MV Orca II
HMS Argyll's commanding officer, Commander Will Warrender, said: "The Royal Navy is working closely with other agencies such as Soca in the fight against drugs.
"I am delighted yet again that we have been able to play our part in the battle to keep drugs off our streets."
Defence Secretary Des Browne said: "This is great news. Our fleet has dealt a considerable blow to those who seek to sell drugs on the streets of Britain, not just once, but four times in the past two months."